Numbers 8:21
The Levites purified themselves and washed their clothing; then Aaron presented them like a wave offering before the Lord, and Aaron made atonement for them to purify them.
Numbers 8:7
And do this to them to purify them: Sprinkle water of purification on them; then have them shave all their body and wash their clothes, and so purify themselves.
Numbers 8:11-13
and Aaron is to offer the Levites before the Lord as a wave offering from the Israelites, that they may do the work of the Lord.
Numbers 8:15
"After this, the Levites will go in to do the work of the tent of meeting. So you must cleanse them and offer them like a wave offering.
Numbers 3:12
"Look, I myself have taken the Levites from among the Israelites instead of every firstborn who opens the womb among the Israelites. So the Levites belong to me,
Numbers 19:12
He must purify himself with water on the third day and on the seventh day, and so will be clean. But if he does not purify himself on the third day and the seventh day, then he will not be clean.
Numbers 19:19
And the clean person must sprinkle the unclean on the third day and on the seventh day; and on the seventh day he must purify him, and then he must wash his clothes, and bathe in water, and he will be clean in the evening.