Leviticus 7:34-36

34For the breast of the wave offering and the thigh contribution I have taken from Bnei-Yisrael out of the sacrifices of their fellowship offerings and have given them to Aaron the kohen and to his sons as their portion forever from Bnei-Yisrael.”

35This is the anointed portion of Aaron and the anointed portion of his sons out of the offerings of Adonai made by fire, on the day when he presented them to serve Adonai in the office of kohen.

36Adonai commanded these to be given to them from Bnei-Yisrael on the day that he anointed them. It is their portion forever throughout their generations.