Leviticus 7:30-32

He must carry that part of the gift in his own hands as an offering made by fire to the LORD. He must bring the fat and the breast of the animal to the priest, to be presented to the LORD as the priests’ share. Then the priest must burn the fat on the altar, but the breast of the animal will belong to Aaron and the priests. You must also give the right thigh from the fellowship offering to the priest as a gift