Leviticus 7:38

32 And the right leg you are to give to the priest for an offering to be lifted up out of what is given for your peace-offerings.

33 That man, among the sons of Aaron, by whom the blood of the peace-offering and the fat are offered, is to have the right leg for his part.

34 For the breast which is waved and the right leg which is lifted up on high I have taken from the children of Israel, from their peace-offerings, and have given them to Aaron the priest and to his sons as their right for ever from the children of Israel.

35 This is the holy part given to Aaron and to his sons, out of the offerings made to the Lord by fire, on the day when they were made priests before the Lord;

36 Which the Lord said the children of Israel were to give them, on the day when he made them his priests. It is their right for ever from generation to generation.

37 These are the laws for the burned offering, the meal offering, and the offering for wrongdoing; and for the making of priests, and for the giving of peace-offerings;

38 As they were given by the Lord to Moses on Mount Sinai, on the day when the Lord gave orders to the children of Israel to make their offerings to the Lord, in the waste land of Sinai.