Parasha Permutations 5780/2020
Which Week Is Which?
This time of year is an interesting one. Right after most of Klal Yisrael’s return to shuls before Shavuos, at least in some format (many due to US President Trump’s declaring ‘Houses of Worship’ as at least as essential as liquor stores, as in these trying times of Covid-19, “we need more prayer, not less”), and many figuring out if / how to catch up on all the parshiyos missed b’tzibbur,  Klal Yisrael entered another parasha-based dilemma.
For five weeks (six Shabbosos), already starting right after Shavuos, and lasting until the Three Weeks, the Jewish world will not be aligned. No, I am not referring to constellations, but rather to the weekly parasha. A simple innocuous question of “What’s this week’s parasha?” will elicit a different response depending on where in the world the question is being asked. This is because the parasha will not be the same regularly scheduled one in Chutz La’aretz as it is in Eretz Yisrael.
Truthfully, this type of dichotomy actually happens not so infrequently, as it essentially occurs whenever the last day of a Yom Tov falls on Shabbos. In Chutz La’aretz where Yom Tov Sheini is halachically mandated, a Yom Tov Krias HaTorah is publicly leined, yet, in Eretz Yisrael (unless by specific Chutznik minyanim) the Krias HaTorah of the next scheduled Parasha is read. This puts Eretz Yisrael a Parasha ahead until the rest of the world soon ‘catches up’, by an upcoming potential double-Parasha, which each would be read separately in Eretz Yisrael.
The reason for this current interesting phenomenon is that this year 5780 / 2020, the second day of Shavuos, observed only outside Eretz Yisrael, fell out on a Shabbos. On that Shabbos / Yom Tov the communities of the Diaspora leined the Yom Tov reading of ‘Asser Te’asser’ (Devarim, Parashas Re’eh, Ch. 14: 22), whereas in Eretz Yisrael, communities read Parashas Naso, the next parasha in the cycle, as Shavuos had already ended for them.
The background for this uncanny occurrence is as follows: It is well known that the Torah is divided into 54 parshiyos, ensuring there are enough parshiyos for every Shabbos of the yearly cycle, which begins and ends on Simchas Torah. Since most (non-leap) years require less than 54 parshiyos, we combine certain parshiyos. This means that two consecutive parshiyos are read on one Shabbos as if they are one long parasha, to make sure that we complete the Torah reading for the year on Simchas Torah.
As detailed by the Abudraham, there are seven potential occurrences when we read “double parshiyos”. These seven are:
Vayakheil / Pekudei, the last two parshiyos of Sefer Shemos.
Tazria / Metzora, in Sefer Vayikra.
Acharei Mos / Kedoshim, in Sefer Vayikra.
Behar / Bechukosai, in Sefer Vayikra.
Chukas / Balak, in Sefer Bamidbar.
Matos / Masei, the last two parshiyos of Sefer Bamidbar.
Netzavim / Vayeileich, towards the end of Sefer Devarim.
However, there are several possible instances in which certain parshiyos are combined in Chutz La’aretz, yet are read on separate weeks in Eretz Yisrael. This is one of them, with those parshiyos being Chukas / Balak.
Although, as mentioned previously, this calanderical conundrum occurs not infrequently, this year’s split seems to contrast greatly with last year’s - 5779 / 2019 - when the odd alignment with Eretz Yisrael being a week ahead continued with a divergence of over three months (!) with Eretz Yisrael out of sync with the rest of the world, and only realigning by Matos / Masei - around Rosh Chodesh Av.
On the other hand, this year, the split will be much shorter, ending right before the Three Weeks, with Chukas and Balak being read separately in Eretz Yisrael and together as a double parasha in the rest of the world.
However, this gives rise to an important question: Many ask, why last year did we not catch up by Chukas / Balak if it fine for us to do so this year? In layman’s terms, why did we wait so long for the whole world to be realigned last year and this year we get to take a shortcut? Or, to paraphrase the Haggada, “Mah nishtana hashana hazos”?
Although this year, with lockdowns due to coronavirus, this issue may not appear to have much practical ramifications, as (of this writing) the Israeli Interior Ministry just re-shut the borders, even to yeshiva bochurim sporting student visas, and even those allowed in to Israel are mandated a 14-day quarantine period, nonetheless, there are important klalim for us to learn.
Although some cite alternate minhagim, nevertheless, it is important to note that nowadays this Parasha split is indeed Minhag Yisrael, as codified by the Gr”a and Mishnah Berurah.  We should also realize that back then travel to and from Eretz Yisrael was far less of an issue, as since undertaking the trip would take several months, missing one Parasha would be the least of one’s worries. But to properly understand the ‘whys’ of this fascinating dual dichotomy, one must first gain an understanding of the Parasha rules and setup. In fact, this is not a new question, as several early Acharonim, including the Maharit, Rav Yosef Tirani, citing Rav Yissachar ben Sussan, one of the foremost experts on intercalation of the Jewish calendar and its minhagim, in his renowned sefer Tikkun Yissachar (written in 1538 / 5298), addressed this issue almost 500 years ago.
While it is true that technically EretzYisrael does not, nor should not, have to take Chutz La’aretz into account, to slow down or join parshiyos together due to their independent luachs (or to be grammatically correct, ‘luchos’) and cycles, as Eretz Yisrael’s is indeed deemed the ikar kriah, nevertheless, there is more to the story.
The Tur, when codifying the halacha, sets four necessary sign-posts in relation to parshiyos, time of year, and various Yomim Tovim. He also offers special codes, mnemonics, as to remember the proper order of parshiyos. In a regular year, he writes, ‘Pikdu U’Pischu’. This refers to Parashas Tzav being Shabbos Hagadol directly before Pesach, ‘Minu V’Atzru’, Parashas Bamidbar is directly prior to Shavuos, ‘Tzumu V’Tzalu’, the fast of Tisha B’Av is directly before Parashas Va’eschanan (also meaning that Parashas Devarim is always Shabbos Chazon andVa’eschanan alwaysShabbos Nachamu), and ‘Kumu V’Tik’u’, that Parashas Netzavim is before Rosh Hashanah. These mnemonics, denoting the four specific rules, or more accurately, necessary points of parasha alignment (or realignment) during the year, are accepted lemaaseh as halachah pesukah by all later authorities. 
So now that we have the necessary background, let’s get back to our question. Last year, as per the halacha pesuka, the world only re-synchronized after 3 months by Matos / Masei, skipping over the potential combo of Chukas / Balak. Yet, this year, we specifically realign byChukas / Balak. Why? What could the difference be?
Pondering the Pearls of Parashas Pinchas
The Bnei Yisaschar cites an interesting reason. He explains that whenever possible, we attempt to ensure the public reading of Chalukas Ha’aretz, the apportioning of Eretz Yisrael, during the period of communal mourning known as Bein Hametzarim, colloquially called ‘The Three Weeks’. This period commemorates the heralding of the beginning of the tragedies that took place prior to the destruction of both Batei Hamikdash, from the breaching of the walls of ancient Yerushalayim on the 17th of Tamuz, until the actual destruction of the Beis Hamikdash on the Tisha B’Av.
The reason for these readings, which are found in the parshiyos ofPinchas, Matos, and Masei, to be leined specifically then, is to remind us of Hashem’s promise, that although we are currently in golus, exile, nevertheless, ‘le’eileh techalek ha’aretz,’ we will still inherit Eretz Yisrael.
A similar assessment is given by the Minchas Yitzchak, albeit regarding Korbanos, especially the Korban Tamid, which is also detailed in Parashas Pinchas. He explains that the Korban Tamid protected Klal Yisrael from sinning with Avodah Zarah. When the Korban Tamid was no longer offered, it enabled the Yetzer Hora of Avodah Zarah to strengthen; and it was due to this sinning that eventually led to the Beis Hamikdash’s destruction.
As such, and since we no longer have Korbanos, but at least we still have their recital, in the vein of ‘v’neshalmah parim sifoseinu’, that our tefillos are their current replacement, the leining of the Korbanos is specifically read during the Three Weeks, when we are mourning the destruction of the Beis Hamikdash. This serves to embolden and enable us to fight the reasons and causes for its destruction, and allow its rebuilding.
An additional point the Bnei Yisaschar raises is that Parashas Pinchas contains the Parashas HaMoadim, the reading detailing all the Yomim Tovim and their observances. He explains that this is also an apropos reading for the Three Weeks, to comfort us in our time of mourning. This is as the Navi Zechariah (Ch. 8: 19) prophesized that when the Geulah comes, this period will be turned into one of great rejoicing (‘l’sasson u’lsimcha ul’moadim tovim’).
For all of the above-mentioned reasons, last year, (5779 / 2019) it was simply not worthwhile for Chutz La’aretz to make Chukas and Balak into a double Parasha merely to catch up to Eretz Yisrael, since if it would have, then Parashas Pinchas will not have fallen out in the Three Weeks. Therefore, it was proper for Chutz La’aretz to wait and not catch up to Eretz Yisrael until Matos / Masei, thus ensuring that Parashas Pinchas be leined during Bein Hametzarim, and enabling us to glean and appreciate its veiled significance and promises for the future.
Yet, this year, the opposite holds true. In 2020, the fast of Shiva Asar B’Tamuz, and hence, the start of the Three Weeks, occurs on Thursday, as does its climax, Tisha B’Av, three weeks later. According to our mnemonic rule cited previously, Parashas Devarim has to be Shabbos Chazon, and the following parasha, Va’eschanan, is always Shabbos Nachamu, directly following Tisha B’Av. This means that the preceding week has to already be the double parasha of Matos / Masei, in order for Parashas Pinchas to be recited during the Three Weeks. If we would wait until Matos / Masei to realign, as we did last year, then for most of the world Parashas Pinchas would not be leined during the Three Weeks, but rather preceding it. Hence, the need to correct the calendar beforeShiva Asar B’Tamuz, in order for Pinchas to be leined by all of Klal Yisrael in the correct time – during the Three Weeks.
The Code for Consolation
The Maharit continues that the reason why Matos and Masei are generally combined is to a similar, yet reverse, reason to Bamidbar. As the Tur wrote, the code for this time of year is ‘Tzumu V’Tzalu’, the fast of Tisha B’Av is directly before Va’eschanan. This is not merely by chance.
Parashas Va’eschanan contains the pesukim of ‘Ki Soleed Banim U’vnei Vanim V’noshantem Ba’aretz’, which although not a pleasant reading, as it is a tochachah (rebuke), nevertheless, Chazal glean that there is a hidden message of redemption buried within.V’noshantem in Gematria equals 852, letting us know that after 852 years of living in Eretz Yisrael, the Galus would start. Yet, we find that the Galus actually started two years early, after 850 years. This is because Hashem did not wantchas veshalom to have to destroy us, and therefore, as a kindness, brought the Exile two years early, to ensure Klal Yisrael’s survival.
Therefore, explains the Maharit, we commonly join up Matos and Masei to make certain that Parashas Va’eschanan is always immediately following Tisha B’Av as Shabbos Nachamu, thus offering us a message of consolation even amidst the destruction.
In conclusion, although it may seem complicated and confusing, on the contrary, each calendarical calculation is clearly consistent with the clarion call of our Chazal - Parasha combination and separation, synchronized to showcase hope and consolation when we need it most, as well as serve as a buffer from condemnation.
The author wishes to thank Rabbi Dovid Heber of the Star-K, author of
Shaarei Zmanim, for his assistance with this article.
This article was written L’ilui Nishmas Asher Zelig ben Zev, L’Refuah Sheleimah Yissochor Dov ben Rochel Miriam, Rochel Miriam bas Dreiza Liba, and Rafael Naftoli Moshe ben Rochel, and L’zechus Shira Yaffa bas Rochel Miriam v’chol yotzei chalatzeha for a yeshua sheleimah teikif u’miyad!
For any questions, comments or for the full Mareh Mekomos / sources, please email the author: firstname.lastname@example.org.
Rabbi Yehuda Spitz, author of M’Shulchan Yehuda on Inyanei Halacha, serves as the Sho’el U’Meishiv and Rosh Chabura of the Ohr Lagolah Halacha Kollel at Yeshivas Ohr Somayach in Yerushalayim. He writes a longstanding contemporary “Insights Into Halacha” column for Ohr Somayach’s website as well. His first English halacha sefer, focusing on halachos pertaining to food, is due out shortly.
 Although whether Kriyas HaTorah is considered a ‘Chovas Yachid’ or’ Chovas Tzibbur’ is a famous “chakirah” of Rav Chaim Soloveitchik of Brisk (cited in Birchas Shmuel, Yevamos 21; see also Eimek Bracha, Krias HaTorah 3), as well as a seeming machlokes Ran and Ramban in the beginning of Maseches Megillah (3a in the Rif’s pagination; see also Biur Halacha 143:1 citing the Chayei Adam vol. 1, 31: 11), nonetheless, the consensus of contemporary poskim is that Krias HaTorah is indeed a Chovas HaTzibbur. See Peulas Sachir on the Maaseh Rav (175), Shu”t Igros Moshe (Orach Chaim vol. 1: 28), Shu”t Tzitz Eliezer (vol. 18: 5), Mikraei Kodesh (Purim 7), Orchos Rabbeinu (vol. 1, Hosafos pg. 10), Halichos Shlomo (Moadim vol. 2, Pesach Ch. 10: 22), Shu”t Yabia Omer (vol. 9, Orach Chaim 28), Yalkut Yosef (Kitzur Shulchan Aruch, Orach Chaim 135: 5), and Yom Tov Sheini Kehilchaso (Ch. 9: 13 - 17) at length, quoting Rav Moshe Feinstein, Rav Shlomo Zalman Auerbach, Rav Elazar Menachem Mann Shach, and Rav Yosef Shalom Elyashiv. Although Tosefes Maaseh Rav (34) relates that when the Vilna Gaon was released from jail, he read all four of the parshiyos he missed at one time, on the other hand, when someone pointed this Maaseh Rav out to Rav Shlomo Zalman Auerbach, after telling a questioner that he is not obligated to find a double-parasha-ed minyan as leining is a Chovas HaTzibbur, Rav Shlomo Zalman retorted rhetorically, “do you truly believe that you are on the Vilna Gaon’s level to perform all of the Minhagei HaGr”a?!”(Halichos Shlomo, ad loc. footnote 90). On the other hand, it is important to note that the Rema (Orach Chaim 135: 2; citing the Ohr Zarua, vol. 2, Hilchos Shabbos 45) rules regarding if an entire tzibbur did not lein one week, that they would be required to make it up the next week along with the current Parasha. In a related sheilah, Rav Ovadia Yosef (Shu”t Yabia Omer, ibid; see also Yalkut Yosef, Kitzur Shulchan Aruch, Orach Chaim, 143: 6), who relates a historical precedent (as cited in sefer Birchos Hamayim Orach Chaim 135, and Shu”t Mekor Yisrael 105) from a severe snowstorm in Yerushalayim in 1787, that lasted from Wednesday through Shabbos - when the entire city was blanketed with so much snow that it was impossible for anyone to have possibly attended, except for one shul that managed to open. The psak given was that the tzibbur should lein a double parasha the next week. See also Rav Yechiel Michel Tukachinsky’s authoritative Luach Eretz Yisrael (5775; Minhagei Hashanah, Nissan: footnote 6). Although there is some debate [see Magen Avraham (135:4 citing the Shu”t Maharam Mintz 85) that a tzibbur can only go back one parasha, and the Olas Tamid (Orach Chaim 282) and Knesses Hagedolah (Hagahos HaTur ad loc.) ruling that way as well; however the Elyah Rabba (282:2), citing the Hagahos Minhagim (Shabbos, Shacharis, 41) arguing that a tzibbur should make up as many parshiyos as were missed, and the Magen Gibborim (Elef Hamagen ad loc. 4), Chida (Shu”t Chaim Sha’al vol. 1:71, 5), Maharam Schick (Shu”t Orach Chaim 335; also citing the Chasam Sofer and Rav Nosson Adler), Maharsham (Daas Torah ad loc.), and Aruch Hashulchan (ad loc. 6) explicitly ruling like the Elyah Rabba; the Mishnah Berurah ad loc. 7 and Kaf Hachaim (ad loc. 5) cite both sides of this debate with no clear-cut hachra’ah, but seem to imply they favor the latter opinion as well] as to how many parshiyos a tzibbur can be expected (or allowed) to ‘make-up’ in one go, nonetheless many contemporary poskim have ruled that in our specific case when of coronavirus, when the vast majority of the world did not have access to minyanim for several months, when the tzibbur is able to get back together, it is preferable that they should lein all the missing parshiyos together. These poskim include Rav Moshe Sternbuch (in his weekly Parasha Sheet Shavuos 5780; he wrote that there is a ‘Maaleh’ to do so), Rav Yitzchak and Rav David Yosef (in Rav Yitzchak Yosef’s teshuva dated 28 Nissan 5780; Rav David cosigned on it, adding ‘Mitzvah rabba lefarsem’), and Rav Moshe Heinemann (in a shiur given soon after Purim 5780; available on the Star-K website). [On the other hand, Rav Asher Weiss (Minchas Asher B’Tekufas HaCorona, Tinyana 34) wrote that in his opinion, it is preferable for the tzibbur not to catch up on all the parshiyos, as aside for the Acharonim who held that a tzibbur shouldn’t make up more than one parasha, there are others who may hold that in this situation the tzibbur may actually be pattur. That, along with the extended risk of people not keeping to the medical guidelines during this extensive Kriya, is reason enough for the tzibbur to davka not catch up on all the missing Kriyos]. In fact, in my neighborhood, on Parashas Bamidbar, there was a special minyan leining all of ‘Toras Kohanim’ – the whole Sefer Vayikra and Parashas Bamidbar for the tzibbur that missed all the Kriyos.
 It is worthwhile knowing that the Rema himself, in his youth, wrote his famous peirush on Megillas Esther, titled “Mechir Yayin,” while in quarantine, to present it to his father as Mishloach Manos (somewhat akin to Rav Shlomo Alkabetz’s famous “Manos Halevi” – see his commentary to Esther Ch. 9:17; decidedly not like the Terumas Hadeshen, vol. 1:11, who rules that one is not yotzei Mishloach Manos with anything but food and drink; although it seems that one may differentiate, as the Rema writes in the introduction that as they were on the run and forced to flee Cracow for the village of Shidlov, there was no money for a Purim Seudah or even wine to drink, so perhaps his sefer as Mishloach Manos is not proof of his disagreeing with the Terumas Hadeshen). The Chida as well, wrote his famous “Shem Gedolim” when in quarantine, as attested to in his Maagal Tov (20 Iyar). In fact, several sheilos that he addressed in his Machzik Bracha (Orach Chaim 55:11; cited in Shaarei Teshuva ad loc. 15), that suddenly became germane for us during coronavirus, such as whether one can be metztaref for a minyan Yidden in several different rooms that can see and hear each other, were his own personal hanhagos and psakim due to his being in quarantine in a lazaretto outside Livorno, Italy in 1774. See Rabbi Yochanan Hershkowitz’s fascinating related article in Hamodia’s Inyan Magazine (May 13, 2020; “Roll Up Your Sleeves and Get Writing”).
 As addressed at length in previous articles titled ‘Rosh Hashanah: The Universal Two Day Yom Tov, (and why Yom Kippur is Not)’ and ‘One Day or Two? What is a Chutznik in Eretz Yisrael to Do?’
 Although the famed Chacham Tzvi (Shu”t 167), and later the Shulchan Aruch Harav (Orach Chaim 496, 11; although he also cites that ‘yesh cholkim’, nonetheless, according to the common consensus, this first opinion is ikar - see also vol. 1, Mahadura Tinyana 68) ruled that even one merely visiting Eretz Yisrael over Yom Tov should keep only one day of Yom Tov like the natives (to paraphrase: ‘when in Israel, do as the Israelis do’), nevertheless, the vast majority of halachic authorities, including the codifier of the Shulchan Aruch himself (Shu”t Avkas Rochel 26) and even the Chacham Tzvi’s own son, Rav Yaakov Emden (Shu”t Sheilas Yaavetz vol. 1: 168), maintained that visitors’ status is dependant on whether or not their intention is to stay and live in Eretz Yisrael, or to return to Chutz La’aretz, known as ‘im da’atam lachzor’ (see next footnote at length). We do however find that the one-day shittah is defended by the Aderes (Sefer Shevach Haaretz, 35) and Shoel U’Meishiv (Shu”t Mahadura Telitai vol. 2: 28), and heavily implied by the Avnei Nezer (Shu”t Orach Chaim 242: 27 and 33; 539: Hashmatos to Hilchos Yom Tov, 48 - end; he maintains that ‘da’atam lachzor’ should not apply even for visitors from Eretz Yisrael who are staying in Chutz La’aretz over Yom Tov) This shittah has also found support in certain Rishonim, including Rabbeinu Chananel’s understanding of Rav Safra’s opinion (Pesachim 51b - 52a), and the Ra’avan (Pesachim 162: 2; see Even Shlomo’s commentary 37). Although, as shown later on, most contemporary authorities do not rule this way, nonetheless, Chabad chassidim generally follow the shittah of their Alter Rebbe, the Shulchan Aruch Harav, and only keep one day in Eretz Yisrael, no matter how long they intend on staying. [However, there are those who cite different minhagim as prevalent in Chabad psak for this inyan. See, for example, Rav Levi Yitzchak Raskin’s extensive Kuntress Yom Tov Sheini, printed in his sefer Nesivim B’sdei HaShlichus vol. 1. Thanks are due to R’ Nochum Shmaryohu Zajac for pointing this out.] Rav Yechiel Michel Tukachinsky (Ir HaKodesh V’Hamikdash vol. 3, Ch. 19: 8 and 11) reports that his grandfather-in-law, the Av Beis Din of Yerushalayim for the latter part of the nineteenth century, Rav Shmuel Salant, was notteh to this shittah as well. However, since he did not want to argue on his Rabbeim, including the Pe’as Hashulchan (see next footnote), who mandated visitors keeping Yom Tov Sheini, Rav Salant ruled that a Ben Chutz La’aretz should keep Yom Tov Sheini lechumrah, a shittah nowadays commonly referred to as ‘A Day and a Half’. This refers to being makpid on not doing any Melachah De’oraysa on the second day, but also not doing the unique Yom Tov Mitzvos, i.e. making Kiddush etc. Rav Avraham Yitzchak HaKohen Kook (Shu”t Orach Mishpat, Orach Chaim 125; thanks are due to Dr. Moshe Simon-Shoshan for pointing out this important source) and Rav Yosef Dov (JB) Soloveitchik (as cited inNefesh HaRav pg. 84) were also known to be proponents of this shittah, reporting that this was also the preferred shittah of the Rav’s grandfather, Rav Chaim Soloveitchik of Brisk. [However, in this author’s opinion, the misnomer for this shittah, ‘A Day and a Half’ is somewhat troublesome. Anecdotally, years ago, I met an older relative here in Eretz Yisrael on Yom Tov Sheini and noticed that she was performing Melachah. When I asked her about it, she innocently replied that her Rabbi told her to keep ‘A Day and a Half’… and it was already after noon...] For more on Rav Shmuel Salant’s shittah, see the annual Tukachinsky Luach Eretz Yisrael (Chol Hamoed Sukkos, footnote), Shu”t Lehoros Nosson (vol. 11: 26), Toras Rabbeinu Shmuel Salant (pg. 120), and Aderes Shmuel (Piskei Rav Shmuel Salant zt”l; Hilchos Yom Tov 129, and in footnotes at length, pg. 131-135).
 Although there are those who want to prove that the Shulchan Aruch meant to rule that a visitor to Eretz Yisrael should only keep one day, as in the Shulchan Aruch (Orach Chaim 496) he only mentions visitors from Eretz Yisrael in Chutz La’aretz, who need to keep a two-day Yom Tov like the locals [see, for example, Ir HaKodesh V’Hamikdash vol. 3, Ch. 19: 11, in the parenthesis, as an additional sevara of Rav Shmuel Salant’s ‘libo amar lo efshar’… ], nevertheless, he personally put that notion to rest in his Shu”t Avkas Rochel (26), where Rav Karo explicitly ruled that the Yom Tov observance of visitors to Eretz Yisrael is dependant on whether they are planning on staying or not. [Indeed, in Ir HaKodesh V’Hamikdash Ch. 19: 8, Rav Tukachinsky himself strongly disavows the aforementioned notion.] Other poskim who rule this way include the Rav Yaakov Emden (Shu”t Sheilas Ya’avetz vol. 1: 168), the Pe’as Hashulchan (Hilchos Eretz Yisrael 2: 15, 21), the Chida (Shu”t Chaim Sha’al vol. 1: 55, and Birkei Yosef, Orach Chaim 496: 7), Mahar”i Chagiz (Shu”t Halachos Ketanos vol. 1: 4; however, his son argues quite extensively, including psakim from his grandfather, Rav Moshe Galanti, and ‘Rabbanei Tzfas’, that Bochurim should certainly only keep one day), the Pri Ha’adamah (vol. 3, pg. 17b, and in Mizbach Adamah, Orach Chaim 468: 4 s.v. ul’inyan; citing ‘kol Rabbanei Yerushalayim’ regarding a Bochur who plans on returning to Chutz La’aretz), Shaarei Teshuvah (Orach Chaim 496: 3, in the parenthesis, and end 5; he makes a sikum of the shittos), Chayei Adam (vol. 2, 103: 4), Aruch Hashulchan (Orach Chaim 496: end 5), Mishnah Berurah (ad loc. 13), Kaf Hachaim (ad loc. 38), and Rav Yechiel Michel Tukachinsky (Ir HaKodesh V’Hamikdash vol. 3, Ch. 19: 8 and 11, and in his annual Luach Eretz Yisrael ibid.; although he does seem to give equal credence to his grandfather-in-law, Rav Shmuel Salant’s ‘Day and a Half’ psak). The vast majority of contemporary poskim rule this way as well. See Shu”t Igros Moshe (Orach Chaim vol. 3: 73 and 74 and vol. 4: 101), Orchos Rabbeinu (new print - 5775 edition, vol. 2, Ch. ‘Yom Tov Sheini’; citing the Chazon Ish and Steipler Gaon), Shu”t Seridei Aish (new edition; vol. 1, Orach Chaim 51: 1), Shu”t Minchas Yitzchak (vol. 4: 1 - 4), Yom Tov Sheini Kehilchaso (pg. 108, footnote 5; citing many Rabbanim including the Tchebiner Rav, Rav Shlomo Zalman Auerbach, Rav Yosef Shalom Elyashiv, and Rav Chaim Pinchas Scheinberg, whose teshuvah is printed in the back of the sefer), Shu”t Shevet Halevi (vol. 5: 64), Shu”t Mishnah Halachos (vol. 4: 83), Shu”t Tzitz Eliezer (vol. 9: 30), Halichos Even Yisrael (Moadim vol. 1, pg. 287 - 288), Shu”t Yaskil Avdi (vol. 4, Orach Chaim 26), Shu”t B’tzeil Hachochmah (vol. 1: 60), Shu”t Yabea Ome r (vol. 6, Orach Chaim 40: 1 - 3), Shu”t Ohr L’Tzion (vol. 3: Ch. 23: 5), Shu”t Knei Bosem (vol. 1: 28), Chazon Ovadia (Yom Tov, pg. 133: 12), and Yalkut Yosef (Moadim, pg. 460).
 Even though the messengers of Tishrei and Nissan would certainly have reached even far flung places by Shavuos, nevertheless, Chazal still established a Yom Tov Sheini for Shavuos, in order not to make a distinction between the Yomim Tovim. See Rambam (Hilchos Kiddush HaChodesh Ch. 3: 12), Shu”t Chasam Sofer (Orach Chaim 146 and Yoreh De’ah 252), Shu”t Sho’el U’Meishiv (Mahadura Tinyana vol. 2: 85 s.v. v’hinei l’fi aniyus daati) and Shu”t Machazeh Avraham (Orach Chaim 121). See also Chiddushei Maran Ri”z HaLevi al HaTorah (Parashas Emor); the Brisker Ravnotes that the exact date of Shavuos is always already set from the beginning of Nisan, as the pasuk states regarding Shavuos (Parashas Emor Ch. 23: 21) that it is observed “b’etzem hayom hazeh”, hence keeping it as a two day Yom Tov is also considered a Takanah of sorts. Moreover, according to Rema M’Fano (Asarah Maamaros), as cited by the Magen Avraham (beg. Orach Chaim 494), according to the shittah of Rav Yosi in Gemara Shabbos (86b-88a), that Mattan Torah actually occurred on 7 Sivan, as well as perhaps the 51st day of Sefira, there is an allusion to Yom Tov Sheini (at least for Shavuos) Min HaTorah. For alternate approaches, see Maharsha (Chiddushei Aggados, Avodah Zarah 3a, on Tosafos s.v. yom hashishi), Chok Yaakov (494:1, citing the Shu”t Rivash 96; see also 430:2), and Ba’er Heitiv (ad loc. 1; at length).
 Abudraham (Seder HaParshiyos). See also Biur HaGr”a (Orach Chaim 428: 4 s.v. l’olam) and Biur Halacha (ad loc. s.v. B’midbar Sinai).
 For example, the Abudraham (Seder HaParshiyos s.v. eilu) mentions Shlach and Korach are combined as regular double-Parshiyos; which to the extent of this authors’ knowledge is not currently practiced. In a similar vein the Tikkun Yissachar mentions a certain Chacham, Harav Saadya Dayan Tzova (presumably a Dayan in Aram Tzova – Aleppo, Syria), who combined Korach and Chukas, an interesting combination that, as the Tikkun Yissachar notes, the rest of the world never combines. However, my esteemed father-in-law, Rabbi Yaacov Tzvi Lieberman, informed me based on his years of learning in Kollel there, that the Chaleb (Syrian) community in Mexico City still follows (or, at least did several decades ago) this unusual combination of Korach and Chukas.
 Biur HaGr”a and Mishnah Berurah (ibid.).
 In an interesting side point, the Gemara (Megillah 29b) mentions an alternate minhag, that of the Bnei Maarava (Eretz Yisrael), “D’maski L’Deoraysa B’tlas Shnin,” that they only complete the Torah every three years, as opposed to our common minhag of doing so every year. Lest one thinks that this minhag was only extant during Talmudic times as the Rambam (Hilchos Tefilla Ch. 13: 1) already wrote in the 1100s that it is not the minhag pashut, on the other hand, we find that famed traveler Binyamin of Tudela (Masa’os Rabi Binyamin M’Tudela; Adler / London edition pg. 63) related that in the early 1170s, in Egypt there were two different co-existing Kehillos, that of the mainstream community finishing the Torah annually, and that of the Bnei Eretz Yisrael, splitting each parasha into three and only concluding the Torah every three years. Indeed, we do find differing views of the parshiyos and their keviyus in the works of several Rishonim. For example, the Chida, at the end of his Shu”t Chaim Sha’al, quotes Kitzur Teshuvos HaRosh as cited from sefer Chazei Hatenufa (54), that the main point is to ensure that the Torah is completed every year. Hence, it is within the rights of ‘Chacham B’Iro’ to decide where to stop, as in his opinion, our parasha setup is not halacha kavua, but rather minhag. The Ohr Zarua (vol. 2, Hilchos Shabbos 45 s.v. maaseh) seems to concur with this assessment as well, stating that there is no keviyus which parasha must specifically be leined on which Shabbos. Yet, it must be stressed that this is not the normative halacha. Thanks are due to Rabbi Moshe Taub for pointing out several of these important sources.
 Shu”t Maharit (vol. 2, Orach Chaim 4), also quoting the Tikkun Yissachar (pg. 38 a -b), based on Tosafos (Megillah 31b s.v. klalos) and the Levush (Orach Chaim 428: 4).
 The Tikkun Yissachar (pg. 32b) explains that as Eretz Yisrael observes Pesach for seven days, exactly as prescribed in the Torah, as opposed to Chutz La’aretz, which observes an eight-day Pesach due to Rabbinic decree (as detailed at length in previous articles titled: ‘Rosh Hashana: The Universal Two-Day Yom Tov (and Why Yom Kippur is Not)’ and ‘One Day or Two? What is a Chutznik in Eretz Yisrael to Do?’), which in turn pushes off the calendar, the Eretz Yisrael Luach is deemed the ikar one and ‘Bnei Ha’Ikari’im’ certainly do not have to be concerned with the calendar of ‘Bnei HaMinhag’. Indeed, regarding a year with similar calendarical structure, but not a leap year [so the ‘split’ occurred with earlier parshiyos and concluded much earlier; this was addressed in a previous article titled ‘Parasha Permutations 5778’], the Tikkun Yissachar (ad loc. s.v. hagahah) relates that the Sefardic Chachamim of Tzfas agreed to separate Tazria and Metzora to be on par with the rest of the world. However, the response of the Rabbanim from the rest of Eretz Yisrael was not long in coming. They utterly rejected the idea, and demanded that they only catch up at Behar / Bechukosai, as that was already the established minhag for generations. The exact quote of the sharply worded rejoinder of the Rabbanim is “Zehu Minhag Avoseinu U’Kadmoneinu B’Yadeinu Mei’Olam V’Shanim Kadmoniyos”.
 According to the Abudraham (pg. 372,Seder HaParshiyos), and Tikkun Yissachar (pg. 38a), and cited lemaaseh by the Levush (Orach Chaim 428: 4), Knesses Hagedolah (ibid. s.v. shittah 44), and Elyah Rabbah (ad loc. 5), the reason why Parashas Tzav generally falls out on Shabbos Hagadol, the Shabbos immediately preceding Pesach, is that it mentions the halachos of Kashering Keilim (Vayikra Ch. 6: 21), albeit regarding the Korban Chata’as, as ‘haga’alas keilim chometz lamud m’Korbanos’. Although in a leap year Parashas Metzora is usually read directly before Pesach, it is also in sync, as it mentions ‘kli cheres yishaver’, which is quite apropos for Pesach as well.
 According to the main commentaries on the Tur and Shulchan Aruch, ‘Pikdu’ means ‘commanded’, hence it is referring to Parashas Tzav, which also means ‘command’. ‘Pischu’ is referring to Pesach. ‘Minu’, ‘count’, refers to Parashas Bamidbar, which deals mainly with the counting of Bnei Yisrael. ‘Atzru’, ‘stop’, refers to Shavuos, by referring to its name that it is called by in the Torah, ‘Atzeres’. ‘Tzumu’, ‘fast’, refers to the fast of Tisha B’Av. ‘Tzulu’, ‘daven’, refers to Parashas Va’eschanan, as it starts with Moshe Rabbeinu’s entreaties to Hashem. ‘Kumu’, ‘stand’, refers to Parashas Nitzavim, literally ‘standing’. And ‘Tik’u’, ‘blow’ refers to Rosh Hashanah, when the Mitzvas Hayom is to blow the Shofar.
 These mnemonics are cited and accepted lemaaseh by all later authorities as well, including the Shulchan Aruch, Levush, and Aruch Hashulchan (Orach Chaim 428: 4).
 Tosafos (Megillah 31b s.v. klalos), and later seconded by the Levush (Orach Chaim 428: 4),explains why Bamidbar must be prior to Shavuos. Since Parashas Bechukosai contains tochachah (rebuke), there must be a noticeable “buffer week” [practically, Parashas Bamidbar] between its reading and Shavuos.This is because we pray that a year and its curses should end, in order to usher in a new year with its blessings - ‘Tichleh shana u’klaloseha,tachel shana u’birchoseha’ (see GemaraMegillah 31b).
This is apropos for Shavuos as it is Rosh Hashanah for Peiros Ha’Ilan, tree fruits (see Gemara Rosh Hashanah 16a). Therefore, Bamidbar must be the stand-alone “buffer week” before Shavuos, in order to emphasize that we are getting Bechukosai in just before Shavuos.
 Knesses Hagedolah (Orach Chaim 428, Haghos on Tur s.v.kishe’ira), Magen Avraham (ad loc. end 6; citing the precedent and rulings of the Maharit and Tikkun Yissachar; see following footnotes), and Mishnah Berurah (ad loc. end 10).
 Bnei Yisaschar (vol. 1, Maamarei Chodshei Tamuz - Av, Maamar 2: 2).
 This three-week season is referred to as such by the Midrash Rabbah (cited by Rashi in his commentary to Eichah Ch. 1, verse 3).
 Minchas Yitzchk al HaTorah (newer edition, vol. 2 pg. 185, Parashas Pinchas s.v. uvazeh).
 He proves this from different maamarei Chazal from Taanis (26a), Yoma (62b), Sanhedrin (56b), as well as the Kli Yakar (Pinchas Ch. 28: 4). His actual maamar was explaining why the fact that Batlu HaTamid on Shiva Asur B’Tamuz is reason enough for fasting.
 Hoshea (Ch. 14: 3). See also Gemara Taanis (27b), Megillah (31b), and Yoma (86b).
 As pointed out by R' Mordechai Waintman, there is another, albeit technical reason why Chutz La'aretz catches up by Chukas/Balak. As Parashas Devarim has to be Shabbos Chazon, the way our calendar is set up this year there simply aren't enough weeks between Shavuos and Shabbos Chazon to allow Chukas and Balak to be split in Chutz La'aretz - as anyway Mattos and Masei are read together this year - even in Eretz Yisrael - due to week limitations. So by default, the only other option to catch up by ends up being Chukas/Balak (which would otherwise not be combined), irrespective of the benefits of ensuring Pinchas is read during the Three Weeks.
 Devarim (Ch. 4: 25).
 In fact, it is also theKriah for Shacharis on Tisha B’Av itself [see Rema (Orach Chaim 559: 4)], thus making it read twice in the same week, perhaps to let its hidden message sink in.
 Gemara Sanhedrin (38a), cited by Rashi on the pasuk. See also Sifsei Chachamim (ad loc.).
 Devarim (Ch. 4: 26).
Disclaimer: This is not a comprehensive guide, rather a brief summary to raise awareness of the issues. In any real case one should ask a competent Halachic authority.
L'iluy Nishmas the Rosh HaYeshiva - Rav Chonoh Menachem Mendel ben R' Yechezkel Shraga, Rav Yaakov Yeshaya ben R' Boruch Yehuda, and l'zchus for Shira Yaffa bas Rochel Miriam and her children for a yeshua teikef u'miyad!