Mitzvah Monopoly
Eretz Yisrael is sanctified above all Lands. How is this sanctity expressed? The Talmud explains that the barley for the omer offering on Pesach, the wheat for the two-loaves offering on Shavuot, and the bikkurim brought to the kohen in the Beit HaMikdash from the first produce of the seven species (mentioned in the Torah in connection with the blessing of the Land) must all be grown only in Eretz Yisrael (Kelim 1:6).
Eretz Yisrael is pure and its mikvaot are pure.
(Mikvaot 8:1)