Leviticus 7:33-34

³³he of the sons of Aaron who is bringing near the blood of the peace-offerings, and the fat, his is the right leg for a portion.

³⁴'For the breast of the wave-offering, and the leg of the heave-offering, I have taken from the sons of Israel, from the sacrifices of their peace-offerings, and I give them to Aaron the priest, and to his sons, by a statute age-during, from the sons of Israel.'