Numbers 18:8-10

8Then the LORD said to Aaron, “Behold, I have put you in charge of My offerings. As for all the sacred offerings of the Israelites, I have given them to you and your sons as a portion and a permanent statute. 9A portion of the most holy offerings reserved from the fire will be yours. From all the offerings they render to Me as most holy offerings, whether grain offerings or sin offerings or guilt offerings, that part belongs to you and your sons. 10You are to eat it as a most holy offering,1 and every male may eat it. You shall regard it as holy.