Leviticus 16:6-11

6And Aaron shall present the bullock of the sin-offering, which is for himself, and make atonement for himself, and for his house.

7And he shall take the two goats, and set them before Jehovah, before the entrance of the tent of meeting.

8And Aaron shall cast lots upon the two goats: one lot for Jehovah, and the other lot for Azazel.

9And Aaron shall present the goat upon which the lot fell for Jehovah, and offer it [as] a sin-offering.

10And the goat upon which the lot fell for Azazel shall be set alive before Jehovah, to make atonement with it, to send it away as Azazel into the wilderness.

11And Aaron shall present the bullock of the sin-offering, which is for himself, and shall make atonement for himself and for his house, and shall slaughter the bullock of the sin-offering which is for himself.