Numbers 18:9, 19

Your share of the holy offerings is that part which is not burned. When the people bring me gifts as most holy offerings, whether they are grain or sin or penalty offerings, they will be set apart for you and your sons.

Anything the Israelites present as holy gifts I, the LORD, give to you, your sons and daughters as your continual portion. This is a lasting agreement of salt before the LORD for you and your children forever.”