Leviticus 7:28-32

Then the Lord spoke to Moses, saying,

“Speak to the sons of Israel, saying, ‘He who offers the sacrifice of his peace offerings to the Lord shall bring his offering to the Lord from the sacrifice of his peace offerings.

His own hands are to bring offerings by fire to the Lord. He shall bring the fat with the breast, so that the breast may be presented as a wave offering before the Lord.

And the priest shall offer up the fat in smoke on the altar, but the breast shall belong to Aaron and to his sons.

And you shall give the right thigh to the priest as a contribution from the sacrifices of your peace offerings.