Numbers 8:13-15

King James Version

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.

¹⁵ And after that shall the Levites go in to do the service of the tabernacle of the congregation: and thou shalt cleanse them, and offer them for an offering.