Numbers 8:13-15

Amplified Bible, Classic Edition

¹³ And you shall present the Levites before Aaron and his sons and offer them as a wave offering to the Lord.

¹⁴ Thus you shall separate the Levites from among the Israelites, and the Levites shall be Mine [in a very special sense].

¹⁵ And after that the Levites shall go in to do service at the Tent of Meeting, when you have cleansed them and offered them as a wave offering.