Leviticus 16:6

3 Herewith 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 coat, and he shall have the linen breeches on his flesh, and shall be girded with the linen sash, and with the linen mitre shall he be attired: they are the holy garments; and he shall bathe his flesh in water, and put them on.

5 He shall take of the congregation of the children of Israel two male goats for a sin-offering, and one ram for a burnt offering.

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

7 He shall take the two goats, and set them before Yahweh at the door of the tent of meeting.

8 Aaron shall cast lots on the two goats; one lot for Yahweh, and the other lot for Azazel.

9 Aaron shall present the goat on which the lot fell for Yahweh, and offer him for a sin-offering.