Numbers 8:12-14

King James Version

¹² And the Levites shall lay their hands upon the heads of the bullocks: and thou shalt offer the one for a sin offering, and the other for a burnt offering, unto the Lord, to make an atonement for the Levites.

¹³ And thou shalt set the Levites before Aaron, and before his sons, and offer them for an offering unto the Lord.

¹⁴ Thus shalt thou separate the Levites from among the children of Israel: and the Levites shall be mine.