Leviticus 16:16-18

16So he is to make atonement for the holy place from the impurities of the Israelites and from their transgressions with regard to all their sins, and thus he is to do for the Meeting Tent which resides with them in the midst of their impurities.

17Nobody is to be in the Meeting Tent when he enters to make atonement in the holy place until he goes out, and he has made atonement on his behalf, on behalf of his household, and on behalf of the whole assembly of Israel.

18“Then he is to go out to the altar which is before the Lord and make atonement for it. He is to take some of the blood of the bull and some of the blood of the goat, and put it all around on the horns of the altar.