Leviticus 16:13

10 But the goat, on which the lot fell for Azazel, shall be set alive before Yahweh, to make atonement for him, to send him away for Azazel into the wilderness.

11 Aaron shall present the bull of the sin-offering, which is for himself, and shall make atonement for himself, and for his house, and shall kill the bull of the sin-offering which is for himself:

12 and he shall take a censer full of coals of fire from off the altar before Yahweh, and his hands full of sweet incense beaten small, and bring it within the veil:

13 and he shall put the incense on the fire before Yahweh, that the cloud of the incense may cover the mercy seat that is on the testimony, that he not die:

14 and he shall take of the blood of the bull, and sprinkle it with his finger on the mercy seat on the east; and before the mercy seat shall he sprinkle of the blood with his finger seven times.

15 Then shall he kill the goat of the sin-offering, that is for the people, and bring his blood within the veil, and do with his blood as he did with the blood of the bull, and sprinkle it on the mercy seat, and before the mercy seat:

16 and he shall make atonement for the holy place, because of the uncleanness of the children of Israel, and because of their transgressions, even all their sins: and so shall he do for the tent of meeting, that dwells with them in the midst of their uncleanness.