Numbers 18:7-11

⁷But only you and your sons are responsible for your priesthood, doing all that concerns the altar and is behind the veil. Only you are to perform that service. I am giving you the gift of your priesthood, but anyone else who approaches the sanctuary must be executed.”

⁸The Lord told Aaron, “Listen, I have put you in charge of officiating at my offerings. All the holy contributions of the Israelites that they bring are reserved for you, and this is a permanent rule.

⁹Part of the most holy offerings taken from the burnt offerings are yours. Part of all the offerings they give me as most holy offerings, whether it's grain offerings or sin offerings or guilt offerings, that part belongs to you and your sons.

¹⁰You shall eat it in a most holy place. Every male is allowed to eat it. You are to regard it as something holy.

¹¹The following also belongs to you: the voluntary gifts as well as all the wave offerings of the Israelites. I have given this to you and your sons and daughters as a permanent rule. Everyone in your household who is ceremonially clean is allowed to eat it.