Lev 7:31-34

31The priest shall turn the fat into smoke on the altar, but the breast shall belong to Aaron and his sons.32And the right thigh from your sacrifices of well-being you shall give to the priest as an offering;33the one among the sons of Aaron who offers the blood and fat of the offering of well-being shall have the right thigh for a portion.34For I have taken the breast of the elevation offering, and the thigh that is offered, from the people of Israel, from their sacrifices of well-being, and have given them to Aaron the priest and to his sons, as a perpetual due from the people of Israel.