Leviticus 7:32-36

³²And the right shoulder of the sacrifices of your peace-offerings shall ye give as a heave-offering unto the priest.

³³He of the sons of Aaron that presenteth the blood of the peace-offerings, and the fat, shall have the right shoulder for his part.

³⁴For the breast of the wave-offering, and the shoulder of the heave-offering, have I taken of the children of Israel from the sacrifices of their peace-offerings, and have given them unto Aaron the priest and unto his sons from the children of Israel by an everlasting statute.

³⁵This is the portion of the anointing of Aaron and of the anointing of his sons, from Jehovah's offerings by fire, in the day when he presented them to serve Jehovah as priests,

³⁶which Jehovah commanded to be given them by the children of Israel in the day that he anointed them: it is an everlasting statute, throughout their generations.