King James Version
And after that shall the Levites go in to do the service of the tabernacle of the congregation: and thou shalt cleanse them, and offer them for an offering.English Standard Version
And after that the Levites shall go in to serve at the tent of meeting, when you have cleansed them and offered them as a wave offering.New International Version
"After you have purified the Levites and presented them as a wave offering, they are to come to do their work at the Tent of Meeting.