Leviticus 7:29-32

29“Tell the Israelites, ‘The one who presents his peace offering sacrifice to the Lord must bring his offering to the Lord from his peace offering sacrifice.

30With his own hands he must bring the Lord’s gifts. He must bring the fat with the breast to wave the breast as a wave offering before the Lord,

31and the priest must offer the fat up in smoke on the altar, but the breast will belong to Aaron and his sons.

32The right thigh you must give as a contribution offering to the priest from your peace offering sacrifices.