Leviticus 16:27, 30

The bull for the sin offering and the goat for the sin offering, whose blood was brought in to make atonement in the Holy Place, shall be carried outside the camp. And they shall burn in the fire their skins, their flesh, and their offal.

For on that day the priest shall make atonement for you, to cleanse you, that you may be clean from all your sins before the LORD.