Leviticus 7:31-35

³¹the which shall burn the inner fatness upon the altar; soothly the breast shall be Aaron’s and his sons’;

³²and the right shoulder of the sacrifices of peaceable things shall turn into the first fruits of the priest. (and the right shoulder of the peace offering shall be a special contribution, given to the priest who killeth the offering.)

³³He that of Aaron’s sons offereth the blood, and the inner fatness, shall have also the right shoulder in his portion. (Yea, the priest, of the sons of Aaron, who offereth the blood, and the inner fat, shall also have the right shoulder for his portion.)

³⁴For I have taken from the sons of Israel the breast of raising, and the shoulder of separating, of their peaceable sacrifices, and I have given those to Aaron the priest and to his sons, by everlasting law, of all the people of Israel. (For I have taken from the Israelites the breast of raising, as a special gift, and the shoulder of separating, as a special contribution, out of their peace offerings, and I have given them to Aaron the priest, and to his sons, by an everlasting law, from all the people of Israel.)

³⁵This is the anointing of Aaron, and of his sons, that is, (their portion of) the offering in the day of their anointing, in the ceremonies of the Lord, in the day wherein Moses offered them, that they should be set in priesthood, (This is the portion for Aaron, and for his sons, out of the offerings given on the day of their installation, or their ordination, in the ceremonies of the Lord, on the day when they were presented to serve as priests,)