Numbers 8:20-22

New American Standard Bible

²⁰ So this is what Moses, Aaron, and all the congregation of the sons of Israel did to the Levites; according to everything that the Lord had commanded Moses regarding the Levites, so the sons of Israel did to them. ^21 (A)The Levites, too, purified themselves from sin and washed their clothes; and Aaron presented them as a wave offering before the Lord. Aaron also made atonement for them to cleanse them. ²² Then after that the Levites went in to perform their service in the tent of meeting before Aaron and his sons; just as the Lord had commanded Moses concerning the Levites, so they did to them.