Leviticus 7:28-31

The Priests’ Share 28The LORD said to Moses, 29“Say to the Israelites: ‘Anyone who brings a fellowship offering to the LORD is to bring part of it as their sacrifice to the LORD . 30With their own hands they are to present the food offering to the LORD ; they are to bring the fat, together with the breast, and wave the breast before the LORD as a wave offering. 31The priest shall burn the fat on the altar, but the breast belongs to Aaron and his sons.