1Yahweh called to Moses, and spoke to him from the Tent of Meeting, saying, 2“Speak to the children of Israel, and tell them, ‘When anyone of you offers an offering to Yahweh, you shall offer your offering of the livestock, from the herd and from the flock.
3“‘If his offering is a burnt offering from the herd, he shall offer a male without defect. He shall offer it at the door of the Tent of Meeting, that he may be accepted before Yahweh. 4He shall lay his hand on the head of the burnt offering, and it shall be accepted for him to make atonement for him. 5He shall kill the bull before Yahweh. Aaron’s sons, the priests, shall present the blood and sprinkle the blood around on the altar that is at the door of the Tent of Meeting. 6He shall skin the burnt offering and cut it into pieces. 7The sons of Aaron the priest shall put fire on the altar, and lay wood in order on the fire; 8and Aaron’s sons, the priests, shall lay the pieces, the head, and the fat in order on the wood that is on the fire which is on the altar; 9but he shall wash its innards and its legs with water. The priest shall burn all of it on the altar, for a burnt offering, an offering made by fire, of a pleasant aroma to Yahweh.
10“‘If his offering is from the flock, from the sheep or from the goats, for a burnt offering, he shall offer a male without defect. 11He shall kill it on the north side of the altar before Yahweh. Aaron’s sons, the priests, shall sprinkle its blood around on the altar. 12He shall cut it into its pieces, with its head and its fat. The priest shall lay them in order on the wood that is on the fire which is on the altar, 13but the innards and the legs he shall wash with water. The priest shall offer the whole, and burn it on the altar. It is a burnt offering, an offering made by fire, of a pleasant aroma to Yahweh.
14“‘If his offering to Yahweh is a burnt offering of birds, then he shall offer his offering from turtledoves or of young pigeons. 15The priest shall bring it to the altar, and wring off its head, and burn it on the altar; and its blood shall be drained out on the side of the altar; 16and he shall take away its crop and its feathers, and cast it beside the altar on the east part, in the place of the ashes. 17He shall tear it by its wings, but shall not divide it apart. The priest shall burn it on the altar, on the wood that is on the fire. It is a burnt offering, an offering made by fire, of a pleasant aroma to Yahweh.
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.