Numbers 18:2-15

²Have your brothers from the tribe of Levi, your father's tribe, join you to help you and your sons with your service in the Tent of the Testimony.

³They will take care of your responsibilities and those relating to the Tent, but they must not come too close to the sacred objects of the sanctuary or the altar, otherwise they will die, and you will too.

⁴They are to help you and take care of the responsibilities of the Tent of Meeting, doing all the work at the Tent, but they are not allowed to be with you during your priestly ministry.

⁵You are to carry out the responsibilities relating to the sanctuary and the altar, so that my anger will not fall on the Israelites again.

⁶Look, I myself have chosen your brothers the Levites from the Israelites as my gift to you, dedicated to the Lord to do the work that relates the Tent of Meeting.

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.

¹²I am giving you all the best olive oil and all the best new wine and grain that the Israelites give as firstfruits to the Lord.

¹³The firstfruits of all the crops they produce in their land that they bring to the Lord are yours. Everyone in your family who is ceremonially clean is allowed to eat them.

¹⁴Everything in Israel that is dedicated to the Lord is yours.

¹⁵Every firstborn, whether human or animal, that is offered to the Lord is yours. But you must buy back every firstborn son and every firstborn male of unclean animals.