Leviticus 7:33

30 He himself is to take to the Lord the offering made by fire, even the fat with the breast, so that the breast may be waved for a wave offering before the Lord.

31 And the fat is to be burned by the priest on the altar, but the breast is for Aaron and his sons.

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.