Leviticus 16:16-18

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.

17No one may be in the tent of meeting from the time Aaron enters the holy place to do this until he comes out. Aaron will make peace with the Lord for his own sins, his family’s sins, and the sins of the entire assembly of Israel.

18Then he will go out to the altar that is in the Lord’s presence and make peace with the Lord there for the sins committed. He will take some of the blood from the bull and some of the goat’s blood and put it all around the horns of the altar.