Numbers 8:18-20

Modern English Version

¹⁸ I have taken the Levites instead of all the firstborn of the children of Israel. ¹⁹ I have given the Levites as a gift to Aaron and to his sons from among the children of Israel, to serve the service of the children of Israel in the tent of meeting and to make an atonement for the children of Israel, so there will be no plague among the children of Israel when the children of Israel approach the sanctuary.

²⁰ Moses and Aaron and all the congregation of the children of Israel did to the Levites; according to all that the Lord commanded Moses concerning the Levites, so the children of Israel did to them.