The Levites purified themselves from sin, and they washed their clothes; and Aharon offered them for a wave offering before the LORD; and Aharon made atonement for them to cleanse them.
the same shall purify himself therewith on the third day, and on the seventh day he shall be clean: but if he doesn't purify himself the third day, then the seventh day he shall not be clean.
and the clean person shall sprinkle on the unclean on the third day, and on the seventh day: and on the seventh day he shall purify him; and he shall wash his clothes, and bathe himself in water, and shall be clean at even.
*Behold, I have taken the Levites from among the children of Yisra'el instead of all the firstborn who open the womb among the children of Yisra'el; and the Levites shall be mine:
Thus did Moshe, and Aharon, and all the congregation of the children of Yisra'el, to the Levites. According to all that the LORD commanded Moshe concerning the Levites, so the children of Yisra'el did to them.
After that, the Levites went in to do their service in the Tent of Meeting before Aharon, and before his sons: as the LORD had commanded Moshe concerning the Levites, so they did to them.
Thus shall you do to them, to cleanse them: sprinkle the water of cleansing on them, let them shave their whole bodies with a razor, and let them wash their clothes, and cleanse themselves.