Numbers 8:8-12

8“They are to take a young bull and its grain offering of fine flour mixed with oil, and you are to take a second young bull for a sin offering.

9Bring the Levites before the tent of meeting and assemble the entire Israelite community.

10Then present the Levites before the Lord, and have the Israelites lay their hands on them.

11Aaron is to present the Levites before the Lord as a presentation offering from the Israelites, so that they may perform the Lord’s work.

12Next the Levites are to lay their hands on the heads of the bulls. Sacrifice one as a sin offering and the other as a burnt offering to the Lord, to make atonement for the Levites.