Leviticus 7:31-35

31And the priest shall burn the fat upon the altar; but the breast shall be Aaron’s and his sons’. 32And the right thigh shall ye give unto the priest for a heave-offering out of the sacrifices of your peace-offerings. 33He among the sons of Aaron that offereth the blood of the peace-offerings, and the fat, shall have the right thigh for a portion. 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;