Numbers 8:21

And the Levites purified themselves from sin and washed their clothes , and Aaron offered them as a wave offering before the Lord , and Aaron made atonement for them to cleanse them.

The Levites purified themselves and washed their clothes. Then Aaron presented them as a wave offering before the Lord and made atonement for them to purify them.

And 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.