Exodus 29:27-28

27And thou shalt hallow the breast of the wave-offering, and the shoulder of the heave-offering, that hath been waved and heaved up, of the ram of the consecration, of that which is for Aaron, and of [that] which is for his sons.

28And they shall be for Aaron and his sons, as an everlasting statute, on the part of the children of Israel; for it is a heave-offering; and it shall be a heave-offering on the part of the children of Israel of the sacrifices of their peace-offerings, [as] their heave-offering to Jehovah.