(Devarim 18:1) "There shall not be to the Cohanim, the Levites, the entire tribe of Levi, a portion and an inheritance with Israel" From (Ibid. 7) "And he (a Cohein) shall minister in the name of the L-rd his G-d," I know only of the Cohanim. Whence do I derive (the same for) the Levites? From (Ibid. 1) "the entire tribe of Levi."