Numbers 18:3-8 And 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.

BSB⁽ⁱ⁾ ³ And 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. ⁴ They 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. ⁵ And you shall attend to the duties of the sanctuary and of the altar, so that wrath may not fall on the Israelites again. ⁶ Behold, 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. ⁷ But 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.” ⁸ Then the LORD said to Aaron, “Behold, I have put you in charge of My offerings. As for all the sacred offerings of the Israelites, I have given them to you and your sons as a portion and a permanent statute.