The Lord tells Moses to tell Aaron that when he lights the lamps, he is to set them so that they give light in front of the lampstand. Aaron does so. The lampstand was made of hammered gold, following the pattern the Lord had shown Moses.
Then the Lord commands that the Levites be taken from among the Israelites and cleansed. Moses sprinkles them with the water of purification, and they shave their whole bodies and wash their clothes. Then they bring a bull and a second bull for a sin offering and a burnt offering. The whole congregation is assembled before the tent of meeting, and the Israelites lay their hands on the Levites. Aaron presents them before the Lord as a wave offering from the Israelites, so that they may do the Lord's service. The Levites in turn lay their hands on the heads of the bulls, and one is offered for sin and the other as a burnt offering, to make atonement for them.
The Lord explains the reason: the Levites are his, taken in place of every firstborn of Israel, because the firstborn have been his since he struck those of Egypt. He gives them as a gift to Aaron and his sons to serve and to make atonement for the Israelites, so that there will be no plague when they come near the sanctuary. Moses, Aaron and the congregation do everything as the Lord commanded. The chapter ends with the rule of age: the Levites serve from twenty-five to fifty years old, and at fifty they retire from the work but may assist their brothers.