Numbers 8:13-15

New International Version

¹³ Have the Levites stand in front of Aaron and his sons and then present them as a wave offering^(A) to the Lord. ¹⁴ In this way you are to set the Levites apart from the other Israelites, and the Levites will be mine.^(B)

¹⁵ “After you have purified the Levites and presented them as a wave offering,^(C) they are to come to do their work at the tent of meeting.^(D)