1Yahweh spoke to Moses in the wilderness of Sinai, in the first month of the second year after they had come out of the land of Egypt, saying, 2“Let the children of Israel keep the Passover in its appointed season. 3On the fourteenth day of this month, at evening, you shall keep it in its appointed season. You shall keep it according to all its statutes and according to all its ordinances.”
4Moses told the children of Israel that they should keep the Passover. 5They kept the Passover in the first month, on the fourteenth day of the month at evening, in the wilderness of Sinai. According to all that Yahweh commanded Moses, so the children of Israel did. 6There were certain men who were unclean because of the dead body of a man, so that they could not keep the Passover on that day, and they came before Moses and Aaron on that day. 7Those men said to him, “We are unclean because of the dead body of a man. Why are we kept back, that we may not offer the offering of Yahweh in its appointed season among the children of Israel?”
8Moses answered them, “Wait, that I may hear what Yahweh will command concerning you.”
9Yahweh spoke to Moses, saying, 10“Say to the children of Israel, ‘If any man of you or of your generations is unclean by reason of a dead body, or is on a journey far away, he shall still keep the Passover to Yahweh. 11In the second month, on the fourteenth day at evening they shall keep it; they shall eat it with unleavened bread and bitter herbs. 12They shall leave none of it until the morning, nor break a bone of it. According to all the statute of the Passover they shall keep it. 13But the man who is clean, and is not on a journey, and fails to keep the Passover, that soul shall be cut off from his people. Because he didn’t offer the offering of Yahweh in its appointed season, that man shall bear his sin.
14“‘If a foreigner lives among you and desires to keep the Passover to Yahweh, then he shall do so according to the statute of the Passover, and according to its ordinance. You shall have one statute, both for the foreigner and for him who is born in the land.’”
15On the day that the tabernacle was raised up, the cloud covered the tabernacle, even the Tent of the Testimony. At evening it was over the tabernacle, as it were the appearance of fire, until morning. 16So it was continually. The cloud covered it, and the appearance of fire by night. 17Whenever the cloud was taken up from over the Tent, then after that the children of Israel traveled; and in the place where the cloud remained, there the children of Israel encamped. 18At the commandment of Yahweh, the children of Israel traveled, and at the commandment of Yahweh they encamped. As long as the cloud remained on the tabernacle they remained encamped. 19When the cloud stayed on the tabernacle many days, then the children of Israel kept Yahweh’s command, and didn’t travel. 20Sometimes the cloud was a few days on the tabernacle; then according to the commandment of Yahweh they remained encamped, and according to the commandment of Yahweh they traveled. 21Sometimes the cloud was from evening until morning; and when the cloud was taken up in the morning, they traveled; or by day and by night, when the cloud was taken up, they traveled. 22Whether it was two days, or a month, or a year that the cloud stayed on the tabernacle, remaining on it, the children of Israel remained encamped, and didn’t travel; but when it was taken up, they traveled. 23At the commandment of Yahweh they encamped, and at the commandment of Yahweh they traveled. They kept Yahweh’s command, at the commandment of Yahweh by Moses.
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.