Numbers 8:21

¹⁹And I gave the Levites presented as a gift to Aaron and his sons out of the midst of the children of Israel, to do the service of the children of Israel in the tabernacle of witness, and to make atonement for the children of Israel: thus there shall be none among the sons of Israel to draw nigh to the holy things.

²⁰And Moses and Aaron, and all the congregation of the children of Israel, did to the Levites as the Lord commanded Moses concerning the Levites, so the sons of Israel did to them.

— Numbers 8:21 —

²²And afterward the Levites went in to minister in their service in the tabernacle of witness before Aaron, and before his sons; as the Lord appointed Moses concerning the Levites, so they did to them.

²³And the Lord spoke to Moses, saying,