Leviticus 16:6-10

Then he will offer the bull for the sin offering for himself to remove sins from him and his family so they will belong to the LORD. “Next Aaron will take the two goats and bring them before the LORD at the entrance to the Meeting Tent. He will throw lots for the two goats—one will be for the LORD and the other for the goat that removes sin. Then Aaron will take the goat that was chosen for the LORD by throwing the lot, and he will offer it as a sin offering. The other goat, which was chosen by lot to remove the sin, must be brought alive before the LORD. The priest will use it to perform the acts that remove Israel’s sin so they will belong to the LORD. Then this goat will be sent out into the desert as a goat that removes sin.