Numbers 18:9, 19

A portion of the holiest offerings kept from the fire will be yours; every one of their offerings that they give me, whether the grain offering, sin offering, or guilt offering will be most holy for you and your sons.

“I give to you and to your sons and daughters all the holy contributions that the Israelites present to the LORD as a permanent statute. It is a permanent covenant of salt  before the LORD for you as well as your offspring.”