Leviticus 16:3-10

3In this manner shall Aaron come into the sanctuary: with a young bullock for a sin-offering, and a ram for a burnt-offering.

4A holy linen vest shall he put on, and linen trousers shall be upon his flesh, and he shall be girded with a linen girdle, and with the linen mitre shall he be attired: these are holy garments; and he shall bathe his flesh in water, and put them on.

5And of the assembly of the children of Israel shall he take two bucks of the goats for a sin-offering, and one ram for a burnt-offering.

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.