Numbers 8:9-11

New Revised Standard Version, Anglicised Catholic Edition

⁹ You shall bring the Levites before the tent of meeting, and assemble the whole congregation of the Israelites. ¹⁰ When you bring the Levites before the Lord, the Israelites shall lay their hands on the Levites, ¹¹ and Aaron shall present the Levites before the Lord as an elevation-offering from the Israelites, that they may perform the service of the Lord.