Leviticus 16:6-16

6 "And Aaron shall offer the bull as a sin offering for himself, and shall make atonement for himself and for his house.
7 Then he shall take the two goats, and set them before the LORD at the door of the tent of meeting;
8 and Aaron shall cast lots upon the two goats, one lot for the LORD and the other lot for Aza'zel.
9 And 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 Aza'zel shall be presented alive before the LORD to make atonement over it, that it may be sent away into the wilderness to Aza'zel.
11 "Aaron shall present the bull as a sin offering for himself, and shall make atonement for himself and for his house; he shall kill the bull as a sin offering for himself.
12 And he shall take a censer full of coals of fire from the altar before the LORD, and two handfuls of sweet incense beaten small; and he shall bring it within the veil
13 and put the incense on the fire before the LORD, that the cloud of the incense may cover the mercy seat which is upon the testimony, lest he die;
14 and 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 he shall sprinkle the blood with his finger seven times.
15 "Then he shall kill the goat of the sin offering which is for the people, and bring its blood within the veil, 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 holy place, 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 abides with them in the midst of their uncleannesses.
Revised Standard Version of the Bible, copyright 1952 [2nd edition, 1971] by the Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.