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 their skins, their flesh, and their dung with fire.

for on this day shall atonement be made for you, to cleanse you. You shall be clean from all your sins before the LORD.