Duties of Priests and Levites
Aaron and his sons bear the priesthood's burden, while the Levites are joined to them as assistants. Their service is real but limited, since coming too near the holy furnishings or altar brings death.
S1o the LORD said to Aaron, “You and your sons and your father’s house must bear the iniquity involving the sanctuary. And you and your sons alone must bear the iniquity involving your priesthood. 2But bring with you also your brothers from the tribe of Levi, the tribe of your father, that they may join you and assist you and your sons before the Tent of the Testimony. 3And they shall attend to your duties and to all the duties of the Tent; but they must not come near to the furnishings of the sanctuary or the altar, or both they and you will die. 4They are to join you and attend to the duties of the Tent of Meeting, doing all the work at the Tent; but no outsider may come near you.
Aaron's house must guard the sanctuary and altar so that wrath does not return to Israel. The Levites are given as a gift for Tent service, while only Aaron and his sons may handle the priesthood itself.
5And you shall attend to the duties of the sanctuary and of the altar, so that wrath may not fall on the Israelites again. 6Behold, I Myself have selected your fellow Levites from the Israelites as a gift to you, dedicated to the LORD to perform the service for the Tent of Meeting. 7But only you and your sons shall attend to your priesthood for everything concerning the altar and what is inside the veil, and you are to perform that service. I am giving you the work of the priesthood as a gift, but any outsider who comes near the sanctuary must be put to death.”