Numbers 8:12-14

New Revised Standard Version Catholic Edition

¹² The Levites shall lay their hands on the heads of the bulls, and he shall offer the one for a sin offering and the other for a burnt offering to the Lord, to make atonement for the Levites. ¹³ Then you shall have the Levites stand before Aaron and his sons, and you shall present them as an elevation offering to the Lord.

¹⁴ Thus you shall separate the Levites from among the other Israelites, and the Levites shall be mine.