The Levites cleansed and purified themselves and they washed their clothes; and Aaron offered them as a wave offering before the Lord and Aaron made atonement for them to cleanse them.
And thus you shall do to them to cleanse them: sprinkle the water of purification [water to be used in case of sin] upon them, and let them pass a razor over all their flesh and wash their clothes and cleanse themselves. [Num. 19:17, 18.]
And the clean person shall sprinkle [the water for purification] upon the unclean person on the third day and on the seventh day, and on the seventh day the unclean man shall purify himself, and wash his clothes and bathe himself in water, and shall be clean at evening.
He shall purify himself with the water for impurity [made with the ashes of the burned heifer] on the third day, and on the seventh day he shall be clean. But if he does not purify himself the third day, then the seventh day he shall not be clean.
Behold, I have taken the Levites from among the Israelites instead of every firstborn who opens the womb among the Israelites; and the Levites shall be Mine,
So Moses and Aaron and all the congregation of the Israelites did thus to the Levites; according to all that the Lord commanded Moses concerning [them], so did the Israelites to them.
And after that the Levites went in to do their service in the Tent of Meeting with the attendance of Aaron and his sons; as the Lord had commanded Moses concerning the Levites, so did they to them.