לג וּלְשֵׁבֶט הַלֵּוִי לֹא־נָתַן מֹשֶׁה נַחֲלָה יְהֹוָה אֱלֹהֵי יִשְׂרָאֵל הוּא נַחֲלָתָם כַּאֲשֶׁר דִּבֶּר לָהֶם׃
The tribe of Levi is the only one who was not assigned a portion of land. Instead of land, Hashem is to be their inheritance: The Kohanim (Priests) and the Leviim (Levites) are to perform the special task of serving in the Holy Temple and teaching Hashem’s Torah to the people. In return, the people, as a whole, are obligated to support them financially, by giving them special gifts from produce grown in Eretz Yisrael, as commanded in the Torah. In the case of the Kohanim, they are also to receive portions of certain sacrifices. Although in our era these gifts are not given, Jews still separate a small amount of all produce grown in Israel. The continuation of this practice is a constant reminder of the sacred obligation to make sure that all members of society are provided with a sufficient livelihood.