Numbers 18:1-5

¹And the Lord said to Aharon: Thou and thy sons, and the house of thy fathers with thee, shall make reconciliation on account of transgressions (against) the sanctuary; and thou and thy sons with thee shall make atonement for the sins of your priesthood.

²And thy brethren also of the tribe of Levi, the tribe of thy father, bring with thee, and let them be added with thee, to serve thee; but thou and, thy sons with thee (shall minister) before the tabernacle of the testimony.

³And they shall keep thy charge, and the charge of all the tabernacle; but to the vessels of the sanctuary and of the altar they (the Levites) shall not approach, that neither they nor you may die.

⁴And they shall be joined, with thee, and keep charge of the tabernacle of ordinance for all the service of the tabernacle, and a stranger shall not come near you.

⁵And they shall keep charge of the sanctuary and of the altar, that there may be no more wrath upon the sons of Israel.