Leviticus 16:15-16

15“Next, Aaron will slaughter the goat for the people’s offering for sin. He will take the blood inside, go up to the canopy, and sprinkle it on the throne of mercy and in front of it, as he did with the bull’s blood.

16So he will make peace with the Lord for all the sins the Israelites committed against the holy place. These sins happened because the Israelites were unclean and because they committed rebellious acts. He will do the same for the tent of meeting which is among an unclean people.