1Yahweh spoke to Moses, saying, 2“Speak to Aaron, and tell him, ‘When you light the lamps, the seven lamps shall give light in front of the lamp stand.’”
3Aaron did so. He lit its lamps to light the area in front of the lamp stand, as Yahweh commanded Moses. 4This was the workmanship of the lamp stand, beaten work of gold. From its base to its flowers, it was beaten work. He made the lamp stand according to the pattern which Yahweh had shown Moses.
5Yahweh spoke to Moses, saying, 6“Take the Levites from among the children of Israel, and cleanse them. 7You shall do this to them to cleanse them: sprinkle the water of cleansing on them, let them shave their whole bodies with a razor, let them wash their clothes, and cleanse themselves. 8Then let them take a young bull and its meal offering, fine flour mixed with oil; and another young bull you shall take for a sin offering. 9You shall present the Levites before the Tent of Meeting. You shall assemble the whole congregation of the children of Israel. 10You shall present the Levites before Yahweh. The children of Israel shall lay their hands on the Levites, 11and Aaron shall offer the Levites before Yahweh for a wave offering on the behalf of the children of Israel, that it may be theirs to do the service of Yahweh.
12“The Levites shall lay their hands on the heads of the bulls, and you shall offer the one for a sin offering and the other for a burnt offering to Yahweh, to make atonement for the Levites. 13You shall set the Levites before Aaron and before his sons, and offer them as a wave offering to Yahweh. 14Thus you shall separate the Levites from among the children of Israel, and the Levites shall be mine.
15“After that, the Levites shall go in to do the service of the Tent of Meeting. You shall cleanse them, and offer them as a wave offering. 16For they are wholly given to me from among the children of Israel; instead of all who open the womb, even the firstborn of all the children of Israel, I have taken them to me. 17For all the firstborn among the children of Israel are mine, both man and animal. On the day that I struck all the firstborn in the land of Egypt, I sanctified them for myself. 18I have taken the Levites instead of all the firstborn among the children of Israel. 19I have given the Levites as a gift to Aaron and to his sons from among the children of Israel, to do the service of the children of Israel in the Tent of Meeting, and to make atonement for the children of Israel, so that there will be no plague among the children of Israel when the children of Israel come near to the sanctuary.”
20Moses, and Aaron, and all the congregation of the children of Israel did so to the Levites. According to all that Yahweh commanded Moses concerning the Levites, so the children of Israel did to them. 21The Levites purified themselves from sin, and they washed their clothes; and Aaron offered them for a wave offering before Yahweh and Aaron made atonement for them to cleanse them. 22After that, the Levites went in to do their service in the Tent of Meeting before Aaron and before his sons: as Yahweh had commanded Moses concerning the Levites, so they did to them.
23Yahweh spoke to Moses, saying, 24“This is what is assigned to the Levites: from twenty-five years old and upward they shall go in to wait on the service in the work of the Tent of Meeting; 25and from the age of fifty years they shall retire from doing the work, and shall serve no more, 26but shall assist their brothers in the Tent of Meeting, to perform the duty, and shall perform no service. This is how you shall have the Levites do their duties.”
Aaron was the son of Amram and Jochebed, the brother of Moses and Miriam. He was the first priest of the people of Israel. He was appointed by God to be a spokesman for Moses when Moses went before the Pharaoh of Egypt to demand that Pharaoh would release the people of Israel from slavery. When facing Pharaoh, it was Aaron who threw his rod before Pharaoh, which turned into a snake. He also assisted Moses in declaring various judgments on Pharaoh and the Egyptian people until finally the Pharaoh conceded to the demand.
Aaron was also present at Sinai when Moses received the Ten Commandments, but he also conceded to the creation of the Golden Calf by the Israelites during the time that Moses was on the mountain receiving the law of God.
Aaron was important for the development of the priesthood in Israel, and had two sons who died, and Eleazar and Ithamar succeeded him as priests. After his death, he was buried on Mt. Hor.
The preceding information is based on Herbert Lockyer, All the Men of the Bible, (Zondervan: Grand Rapids, MI, 1958) and All the Women of the Bible (Zondervan: Grand Rapids, MI, 1967), Who's Who in the Bible (Bonanza Books, New York, 1981), and Biographies of Bible Characters, People and Characters in the Bible.