1Yahweh spoke to Moses, saying, 2“Speak to Aaron, and to his sons, and to all the children of Israel, and say to them, ‘This is the thing which Yahweh has commanded: 3Whatever man there is of the house of Israel who kills a bull, or lamb, or goat in the camp, or who kills it outside the camp, 4and hasn’t brought it to the door of the Tent of Meeting to offer it as an offering to Yahweh before Yahweh’s tabernacle: blood shall be imputed to that man. He has shed blood. That man shall be cut off from among his people. 5This is to the end that the children of Israel may bring their sacrifices, which they sacrifice in the open field, that they may bring them to Yahweh, to the door of the Tent of Meeting, to the priest, and sacrifice them for sacrifices of peace offerings to Yahweh. 6The priest shall sprinkle the blood on Yahweh’s altar at the door of the Tent of Meeting, and burn the fat for a pleasant aroma to Yahweh. 7They shall no more sacrifice their sacrifices to the goat idols, after which they play the prostitute. This shall be a statute forever to them throughout their generations.’
8“You shall say to them, ‘Any man there is of the house of Israel, or of the strangers who live as foreigners among them, who offers a burnt offering or sacrifice, 9and doesn’t bring it to the door of the Tent of Meeting to sacrifice it to Yahweh, that man shall be cut off from his people.
10“‘Any man of the house of Israel, or of the strangers who live as foreigners among them, who eats any kind of blood, I will set my face against that soul who eats blood, and will cut him off from among his people. 11For the life of the flesh is in the blood. I have given it to you on the altar to make atonement for your souls; for it is the blood that makes atonement by reason of the life. 12Therefore I have said to the children of Israel, “No person among you may eat blood, nor may any stranger who lives as a foreigner among you eat blood.”
13“‘Whatever man there is of the children of Israel, or of the strangers who live as foreigners among them, who takes in hunting any animal or bird that may be eaten, he shall pour out its blood, and cover it with dust. 14For as to the life of all flesh, its blood is with its life. Therefore I said to the children of Israel, “You shall not eat the blood of any kind of flesh; for the life of all flesh is its blood. Whoever eats it shall be cut off.”
15“‘Every person that eats what dies of itself, or that which is torn by animals, whether he is native-born or a foreigner, shall wash his clothes, and bathe himself in water, and be unclean until the evening. Then he shall be clean. 16But if he doesn’t wash them, or bathe his flesh, then he shall bear his iniquity.’”
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.