Leviticus 7:19-21

¹⁹You shall also speak to the children of Israel, saying, He that offers a sacrifice of peace-offering, shall bring his gift to the Lord also from the sacrifice of peace-offering.

²⁰His hands shall bring the burnt offerings to the Lord; the fat which is on the breast and the lobe of the liver, he shall bring them, so as to set them for a gift before the Lord.

²¹And the priest shall offer the fat upon the altar, and the breast shall be Aaron's and his sons,