Leviticus 7:33-34

³³He among the sons of Aaron, that offereth the blood, and the fat, he shall have the right shoulder also for his portion.

³⁴For the breast that is elevated and the shoulder that is separated I have taken of the children of Israel, from off their victims of peace offerings, and have given them to Aaron the priest, and to his sons, by a law for ever, from all the people of Israel.