Numbers 18:9, 19

You are allotted the portion of the most holy offerings that is not burned on the fire. This portion of all the most holy offerings—including the grain offerings, sin offerings, and guilt offerings—will be most holy, and it belongs to you and your sons.

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.”