Leviticus 16:6-10

Then Aaron shall offer the bull as the sin offering, which is for himself, so that he may make atonement for himself and for his household.

He shall then take the two goats and present them before the Lord at the doorway of the tent of meeting.

Aaron shall cast lots for the two goats, one lot for the Lord and the other lot for the scapegoat.

Then Aaron shall offer the goat on which the lot for the Lord fell, and make it a sin offering.

But the goat on which the lot for the scapegoat fell shall be presented alive before the Lord, to make atonement upon it, to send it into the wilderness as the scapegoat.