Numbers 8 15
They can come and serve at the Tent of Meeting once you've purified them and presented them as a wave offering.
Compare with other 3 random translations
GW Numbers 8:15“Once you have made them clean and presented them as an offering, the Levites may come and do their work at the tent of meeting.
ERV Numbers 8:15“So make the Levites pure and give them to the Lord as a special offering. After you do this, they can come and do their work at the Meeting Tent.
LSV Numbers 8:15and afterward the Levites come in to serve the Tent of Meeting, and you have cleansed them, and have waved them as a wave-offering.