Numbers 8:13-15

New Catholic Bible

¹³ “You shall have the Levites stand before Aaron and his sons to present them as a wave offering to the Lord. ¹⁴ Thus you will separate the Levites from the people of Israel, and the Levites will be mine. ¹⁵ After this the Levites can go in and serve the needs of the tent of meeting, when you have purified them and offered them as a wave offering.