Numbers 8:20-22

New Catholic Bible

²⁰ So Moses and Aaron and all the assembly of the people of Israel did to the Levites what God had commanded Moses concerning the Levites, that is what the people of Israel did to them. ²¹ The Levites purified themselves and washed their clothes. Aaron presented them as a wave offering to the Lord, and made atonement for them to purify them. ²² Then the Levites went in and performed the work of the tent of meeting under the authority of Aaron and his sons. They did to the Levites the things that the Lord had commanded Moses concerning them.