Leviticus 7:33-38 RSV

33 he among the sons of Aaron who offers the blood of the peace offerings and the fat shall have the right thigh for a portion.
34 For the breast that is waved and the thigh that is offered I have taken from the people of Israel, out of the sacrifices of their peace offerings, and have given them to Aaron the priest and to his sons, as a perpetual due from the people of Israel.
35 This is the portion of Aaron and of his sons from the offerings made by fire to the LORD, consecrated to them on the day they were presented to serve as priests of the LORD;
36 the LORD commanded this to be given them by the people of Israel, on the day that they were anointed; it is a perpetual due throughout their generations."
37 This is the law of the burnt offering, of the cereal offering, of the sin offering, of the guilt offering, of the consecration, and of the peace offerings,
38 which the LORD commanded Moses on Mount Sinai, on the day that he commanded the people of Israel to bring their offerings to the LORD, in the wilderness of Sinai.