Leviticus 7:33-38 NLT

33 The right thigh must always be given to the priest who sprinkles the blood and offers the fat of the peace offering.
34 For I have designated the breast and the right thigh for the priests. It is their regular share of the peace offerings brought by the Israelites.
35 This is their share. It has been set apart for Aaron and his descendants from the offerings given to the LORD by fire from the time they were appointed to serve the LORD as priests.
36 The LORD commanded that the Israelites were to give these portions to the priests as their regular share from the time of the priests' anointing. This regulation applies throughout the generations to come."
37 These are the instructions for the whole burnt offering, the grain offering, the sin offering, the guilt offering, the ordination offering, and the peace offering.
38 The LORD gave these instructions to Moses on Mount Sinai when he commanded the Israelites to bring their offerings to the LORD in the wilderness of Sinai.