Leviticus 7:30-32

³⁰He himself must bring the offering that will be burned in the fire. He must bring the fat along with the breast of the animal and lift it up in front of Yahweh to indicate that it is an offering to him.

³¹The Supreme Priest must burn the fat on the altar, but the breast belongs to Aaron and all his sons.

³²You must give to the Supreme Priest the right thigh of the animal that is sacrificed to maintain fellowship with Yahweh.