Numbers 18:8, 19

The LORD gave these further instructions to Aaron: “I myself have put you in charge of all the holy offerings that are brought to me by the people of Israel. I have given all these consecrated offerings to you and your sons as your permanent share.

Yes, I am giving you all these holy offerings that the people of Israel bring to the LORD. They are for you and your sons and daughters, to be eaten as your permanent share. This is an eternal and unbreakable covenant between the LORD and you, and it also applies to your descendants.”