The Talmud states that Moshe Rabbeinu (Moses our Teacher) begged G-d to allow him to enter the Land of Israel and to perform the Mitzvot that can only be observed there.
The Mitzvot of the Land have been performed in an unbroken chain since Joshua and the Jewish people entered the Land of Israel over 3,400 years ago
Jews who keep the Mitzvot of the Land are called “Mighty Men of Power” – the only other time this term is used is when the Jewish nation accepted G-d’s Torah at Mount Sinai
Just as Shabbat (Sabbath) is the weekly cycle through which we demonstrate our complete trust in G-d, so too, from the blessings of the Land He gave us, we Tithe, we give to the poor and we keep His Shabbat of the Land holy (Sefer HaChinuch 84)
The Land of Israel is the “King’s Palace”. The produce of the King’s Palace is special – and just as our sustenance is derived from His produce we grow in the Palace, we must ensure that it is kept holy and portions are separated appropriately – so that we benefit from the blessings of His handiwork (Sefer HaChinuch 385 & Sefer Chareidim)