Numbers 8:11-15

11Raising his hands, Aaron must then present the Levites to the Lord as a special offering from the people of Israel, thus dedicating them to the Lord’s service.

12“Next the Levites will lay their hands on the heads of the young bulls. Present one as a sin offering and the other as a burnt offering to the Lord, to purify the Levites and make them right with the Lord.

13Then have the Levites stand in front of Aaron and his sons, and raise your hands and present them as a special offering to the Lord.

14In this way, you will set the Levites apart from the rest of the people of Israel, and the Levites will belong to me.

15After this, they may go into the Tabernacle to do their work, because you have purified them and presented them as a special offering.