Leviticus 16:10-11

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. “Then Aaron will offer the bull as a sin offering for himself, to remove the sins from him and his family so they will belong to the LORD; he will kill the bull for the sin offering for himself.