Numbers 18:4-7 The Message (MSG)
Duties in the Tent of Testimony
18 1-4 God said to Aaron, “You and your sons, along with your father’s family, are responsible for taking care of sins having to do with the Sanctuary; you and your sons are also responsible for sins involving the priesthood. So enlist your brothers of the tribe of Levi to join you and assist you and your sons in your duties in the Tent of Testimony. They will report to you as they go about their duties related to the Tent, but they must not have anything to do with the holy things of the Altar under penalty of death—both they and you will die! They are to work with you in taking care of the Tent of Meeting, whatever work is involved in the Tent. Outsiders are not allowed to help you.
5-7 “Your job is to take care of the Sanctuary and the Altar so that there will be no more outbreaks of anger on the People of Israel. I personally have picked your brothers, the Levites, from Israel as a whole. I’m giving them to you as a gift, a gift of God, to help with the work of the Tent of Meeting. But only you and your sons may serve as priests, working around the Altar and inside the curtain. The work of the priesthood is my exclusive gift to you; it cannot be delegated—anyone else who invades the Sanctuary will be executed.”