Numbers 8:4-10
English Standard Version
5And the Lord spoke to Moses, saying,
6"Take the Levites from among the people of Israel and cleanse them.
7Thus you shall do to them to cleanse them: sprinkle the water of purification upon them, and let them go with a razor over all their body, and wash their clothes and cleanse themselves.
8Then let them take a bull from the herd and its grain offering of fine flour mixed with oil, and you shall take another bull from the herd for a sin offering.
9And you shall bring the Levites before the tent of meeting and assemble the whole congregation of the people of Israel.
10When you bring the Levites before the Lord, the people of Israel shall lay their hands on the Levites,