Leviticus 7:24-28

²⁴For I have taken the wave-breast and shoulder of separation from the children of Israel from the sacrifices of your peace-offerings, and I have given them to Aaron the priest and his sons, a perpetual ordinance due from the children of Israel.

²⁵This is the anointing of Aaron, and the anointing of his sons, their portion of the burnt offerings of the Lord, in the day in which he brought them forward to minister as priests to the Lord;

²⁶as the Lord commanded to give to them in the day in which he anointed them of the sons of Israel, a perpetual statute through their generations.

²⁷This is the law of the whole burnt offerings, and of sacrifice, and of sin-offering, and of offering for transgression, and of the sacrifice of consecration, and of the sacrifice of peace-offering;

²⁸as the Lord commanded Moses in the mount Sina, in the day in which he commanded the children of Israel to offer their gifts before the Lord in the wilderness of Sina.