Numbers 8:13

¹¹And Aaron shall separate the Levites for a gift before the Lord from the children of Israel: and they shall be prepared to perform the works of the Lord.

¹²And the Levites shall lay their hands on the heads of the calves; and thou shalt offer one for a sin offering, and the other for a whole burnt offering to the Lord, to make atonement for them.

— Numbers 8:13 —

¹⁴And thou shalt separate the Levites from the midst of the sons of Israel, and they shall be mine.

¹⁵And afterward the Levites shall go in to perform the works of the tabernacle of witness; and thou shalt purify them, and present them before the Lord.