Leviticus 7:31-34

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; it will belong to the priest who offers the blood and fat of the fellowship offering. I have taken the breast and the thigh from the fellowship offerings of the Israelites, and I have given these parts to Aaron and the priests as their share for all time from the Israelites.’ ”