1Yahweh spoke to Moses, saying, 2“Speak to the children of Israel, and take rods from them, one for each fathers’ house, of all their princes according to their fathers’ houses, twelve rods. Write each man’s name on his rod. 3You shall write Aaron’s name on Levi’s rod. There shall be one rod for each head of their fathers’ houses. 4You shall lay them up in the Tent of Meeting before the covenant, where I meet with you. 5It shall happen that the rod of the man whom I shall choose shall bud. I will make the murmurings of the children of Israel, which they murmur against you, cease from me.”
6Moses spoke to the children of Israel; and all their princes gave him rods, for each prince one, according to their fathers’ houses, a total of twelve rods. Aaron’s rod was among their rods. 7Moses laid up the rods before Yahweh in the Tent of the Testimony.
8On the next day, Moses went into the Tent of the Testimony; and behold, Aaron’s rod for the house of Levi had sprouted, budded, produced blossoms, and bore ripe almonds. 9Moses brought out all the rods from before Yahweh to all the children of Israel. They looked, and each man took his rod.
10Yahweh said to Moses, “Put back the rod of Aaron before the covenant, to be kept for a token against the children of rebellion; that you may make an end of their complaining against me, that they not die.” 11Moses did so. As Yahweh commanded him, so he did.
12The children of Israel spoke to Moses, saying, “Behold, we perish! We are undone! We are all undone! 13Everyone who keeps approaching Yahweh’s tabernacle, dies! Will we all perish?”
Aaron was the son of Amram and Jochebed, the brother of Moses and Miriam, and the first priest of Israel. God appointed Aaron to be Moses' spokesman in his audiences with the unnamed Pharaoh of Exodus. As a symbol of his office, Aaron received a magical rod. He turned the rod into a snake - the first in a series of signs, by which he and Moses hoped to persuade Pharaoh to let the Israelites leave Egypt. Aaron also used the rod to call down three of the plagues that followed this first sign (polluting the Nile, frogs and gnats). God also caused the rod to blossom and bear ripe almonds, as a sign that Aaron's descendants would inherit the priesthood.
God summoned Aaron to be present when Moses received the Ten Commandments. But Aaron did not stay on Sinai. Instead he agreed to oversee the casting of an idol (a golden calf) for the Israelites who had rebelled against the authority of the absent Moses.
Aaron was generally a supporter of Moses, but took him to task for his marrying a Cushite wife. For this God rebuked Aaron (and Miriam). His role as priest was critical when he made atonement for the Israelites and stayed the plague that had followed the rebellion of Dathan and Abiram. Exodus and Leviticus give a detailed account of the vestments and duties of Aaron and of his sons.
Aaron's elder sons, Nadab and Abihu, died early but the younger pair, Eleazar and Ithamar, succeeded him in the priesthood. When Aaron was a hundred and twenty three, God instructed him to go up onto Mt. Hor, where he died. Aaron figures prominently in Exodus, Leviticus, Deuteronomy and Numbers, and is named in other books of both Old and New Testaments.