As the high priest, Aaron has to offer a sacrifice of atonement on behalf of the people of Israel. As we see in Leviticus 16:2-28, the sacrifice is accompanied by great ritual, and it must be performed again and again to make up for the Israelites’ sins.
The Lord said to Moses:
Tell your brother Aaron not to come just at any time into the sanctuary inside the curtain before the mercy seat that is upon the ark, or he will die; for I appear in the cloud upon the mercy seat. 3 Thus shall Aaron come into the holy place: with a young bull for a sin offering and a ram for a burnt offering. 4 He shall put on the holy linen tunic, and shall have the linen undergarments next to his body, fasten the linen sash, and wear the linen turban; these are the holy vestments. He shall bathe his body in water, and then put them on. 5 He shall take from the congregation of the people of Israel two male goats for a sin offering, and one ram for a burnt offering.
6 Aaron shall offer the bull as a sin offering for himself, and shall make atonement for himself and for his house. 7 He shall take the two goats and set them before the Lord at the entrance of the tent of meeting; 8 and Aaron shall cast lots on the two goats, one lot for the Lord and the other lot for Azazel. 9 Aaron shall present the goat on which the lot fell for the Lord, and offer it as a sin offering; 10 but the goat on which the lot fell for Azazel[d] shall be presented alive before the Lord to make atonement over it, that it may be sent away into the wilderness to Azazel.
11 Aaron shall present the bull as a sin offering for himself, and shall make atonement for himself and for his house; he shall slaughter the bull as a sin offering for himself. 12 He shall take a censer full of coals of fire from the altar before the Lord, and two handfuls of crushed sweet incense, and he shall bring it inside the curtain 13 and put the incense on the fire before the Lord, that the cloud of the incense may cover the mercy seat[f] that is upon the covenant, or he will die. 14 He shall take some of the blood of the bull, and sprinkle it with his finger on the front of the mercy seat, and before the mercy seat[i] he shall sprinkle the blood with his finger seven times.
15 He shall slaughter the goat of the sin offering that is for the people and bring its blood inside the curtain, and do with its blood as he did with the blood of the bull, sprinkling it upon the mercy seat and before the mercy seat. 16 Thus he shall make atonement for the sanctuary, because of the uncleannesses of the people of Israel, and because of their transgressions, all their sins; and so he shall do for the tent of meeting, which remains with them in the midst of their uncleannesses. 17 No one shall be in the tent of meeting from the time he enters to make atonement in the sanctuary until he comes out and has made atonement for himself and for his house and for all the assembly of Israel. 18 Then he shall go out to the altar that is before the Lord and make atonement on its behalf, and shall take some of the blood of the bull and of the blood of the goat, and put it on each of the horns of the altar. 19 He shall sprinkle some of the blood on it with his finger seven times, and cleanse it and hallow it from the uncleannesses of the people of Israel.
20 When he has finished atoning for the holy place and the tent of meeting and the altar, he shall present the live goat. 21 Then Aaron shall lay both his hands on the head of the live goat, and confess over it all the iniquities of the people of Israel, and all their transgressions, all their sins, putting them on the head of the goat, and sending it away into the wilderness by means of someone designated for the task. 22 The goat shall bear on itself all their iniquities to a barren region; and the goat shall be set free in the wilderness.
23 Then Aaron shall enter the tent of meeting, and shall take off the linen vestments that he put on when he went into the holy place, and shall leave them there. 24 He shall bathe his body in water in a holy place, and put on his vestments; then he shall come out and offer his burnt offering and the burnt offering of the people, making atonement for himself and for the people. 25 The fat of the sin offering he shall turn into smoke on the altar. 26 The one who sets the goat free for Azazel shall wash his clothes and bathe his body in water, and afterward may come into the camp. 27 The bull of the sin offering and the goat of the sin offering, whose blood was brought in to make atonement in the holy place, shall be taken outside the camp; their skin and their flesh and their dung shall be consumed in fire. 28 The one who burns them shall wash his clothes and bathe his body in water, and afterward may come into the camp.
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