Leviticus 9:18-21

18Then he killed the ox and the ram, the sacrifice of peace offerings for the people. And Aaron's sons handed him the blood, and he threw it against the sides of the altar.

19But the fat pieces of the ox and of the ram, the fat tail and that which covers the entrails and the kidneys and the long lobe of the liver—

20they put the fat pieces on the breasts, and he burned the fat pieces on the altar,

21but the breasts and the right thigh Aaron waved for a wave offering before the Lord, as Moses commanded.