New Revised Standard Version
The Levites purified themselves from sin and washed their clothes; then Aaron presented them as an elevation offering before the LORD, and Aaron made atonement for them to cleanse them.

Contemporary English Version
The Levites sprinkled themselves with the water of forgiveness and washed their clothes. Then Aaron brought them to the altar and offered sacrifices to forgive their sins and make them acceptable to the LORD.

New American Bible
When the Levites had purified themselves and washed their garments, Aaron presented them as an elevated offering before the LORD, and made atonement for them to cleanse them.

Douay-Rheims Bible
And they were purified, and washed their garments. And Aaron lifted them up in the sight of the Lord, and prayed for them,

And they were purified, and washed their garments. And Aaron lifted them up in the sight of the Lord, and prayed for them,

were purified

Numbers 8:7 According to this rite: Let them be sprinkled with the water of purification, and let them shave all the hairs of their flesh. And when they shall have washed their garments, and are cleansed,

Numbers 19:12,19 Shall be sprinkled with this water on the third day, and on the seventh, and so shall be cleansed. If he were not sprinkled on the third day, he cannot be cleansed on the seventh. . . .

offered

Numbers 8:11-13,15 And Aaron shall offer the Levites, as a gift in the sight of the Lord from the children of Israel, that they may serve in his ministry. . . .

Numbers 3:12 I have taken the Levites from the children of Israel, for every firstborn that openeth the womb among the children of Israel, and the Levites shall be mine.

Aaron made

Numbers 8:12 The Levites also shall put their hands upon the heads of the oxen, of which thou shalt sacrifice one for sin, and the other for a holocaust to the Lord, to pray for them.