Numbers 18:3-5

Amplified Bible, Classic Edition

³ And the Levites shall attend you [as servants] and attend to all the duties of the Tent; only they shall not come near the sacred vessels of the sanctuary or to the brazen altar, that they and also you [Aaron] die not.

⁴ And they shall be joined to you and attend to the duties of the Tent of Meeting—all the [menial] service of the Tent—and no stranger [no layman, anyone who is not a Levite] shall come near you [Aaron and your sons].

⁵ And you shall attend to the duties of the sanctuary and attend to the altar [of burnt offering and the altar of incense], that there be no wrath any more upon the Israelites [as in the incident of Korah, Dathan, and Abiram].^(A)