Leviticus 7:34-36

34For the wave-breast and the heave-thigh have I taken of the children of Israel out of the sacrifices of their peace-offerings, and have given them unto Aaron the priest and unto his sons as their portion for ever from the children of Israel.

35This is the anointing-portion of Aaron, and the anointing-portion of his sons, out of the offerings of Jehovah made by fire, in the day when he presented them to minister unto Jehovah in the priest’s office; 36which Jehovah commanded to be given them of the children of Israel, in the day that he anointed them. It is their portion for ever throughout their generations.