Leviticus 16:8

5 And let him take from the children of Israel two he-goats for a sin-offering and one male sheep for a burned offering.

6 And Aaron is to give the ox of the sin-offering for himself, to make himself and his house free from sin.

7 And he is to take the two goats and put them before the Lord at the door of the Tent of meeting.

8 And Aaron will make selection from the two goats by the decision of the Lord, one goat for the Lord and one for Azazel.

9 And the goat which is marked out for the Lord, let Aaron give for a sin-offering.

10 But the goat for Azazel is to be placed living before the Lord, for the taking away of sin, that it may be sent away for Azazel into the waste land.

11 And Aaron is to give the ox of the sin-offering for himself and take away sin from himself and his house, and put to death the ox of the sin-offering which is for himself.