Leviticus 7:34; Leviticus 7:36

34 'For I have taken the breast of the wave offering and the thigh of the contribution from the sons of Israel from the sacrifices of their peace offerings, and have given them to Aaron the priest and to his sons as their due forever from the sons of Israel.

36 'These the LORD had commanded to be given them from the sons of Israel in the day that He anointed them. It is their due forever throughout their generations.' "