Numbers 8 21
The Levites purified themselves and washed their clothes. Then Aaron presented them as a wave offering to the Lord. Aaron also presented the sacrifice to make them right with the Lord so they would be clean.
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ASV Numbers 8:21And the Levites purified themselves from sin, and they washed their clothes: and Aaron offered them for a wave-offering before Jehovah; and Aaron made atonement for them to cleanse them.
CSB Numbers 8:21The Levites purified themselves and washed their clothes; then Aaron presented them before the Lord as a presentation offering. Aaron also made atonement for them to cleanse them ceremonially.
KJV Numbers 8:21And the Levites were purified, and they washed their clothes; and Aaron offered them as an offering before the Lord; and Aaron made an atonement for them to cleanse them.