Numbers 18:8-12

Then the Lord spoke to Aaron, “Now behold, I Myself have put you in charge of My offerings, all the holy gifts of the sons of Israel I have given to you as a portion and to your sons as a permanent allotment.

This shall be yours from the most holy gifts reserved from the fire; every offering of theirs, namely every grain offering, every sin offering, and every guilt offering, with which they shall make restitution to Me, shall be most holy for you and for your sons.

As the most holy gifts you shall eat it; every male shall eat it. It shall be holy to you.

This also is yours, the offering of their gift, that is, all the wave offerings of the sons of Israel; I have given them to you and to your sons and daughters with you as a permanent allotment. Everyone of your household who is clean may eat it.

All the best of the fresh oil and all the best of the fresh wine and of the grain, the first fruits of what they give to the Lord, I have given them to you.