Exodus 29:27-28

27You shall consecrate the breast of the wave offering and the thigh of the heave offering which was waved and which was 1offered from the ram of 2ordination, from the one which was for Aaron and from the one which was for his sons. 28It shall be for Aaron and his sons as their portion forever from the sons of Israel, for it is a heave offering; and it shall be a heave offering from the sons of Israel from the sacrifices of their peace offerings, even their heave offering to the Lord.