Leviticus 16:16-18

161He shall make atonement for the Holy Place, because of the impurities of the sons of Israel and because of their unlawful acts regarding all their sins; and he shall do so for the tent of meeting which remains with them in the midst of their impurities.

17When he goes in to make atonement in the Holy Place, no one shall be in the tent of meeting until he comes out, so that he may make atonement for himself and for his household, and for all the assembly of Israel.

18Then he shall go out to the altar that is before the Lord and make atonement for it; he shall take some of the blood from the bull and some of the blood from the goat, and 2put it on the horns of the altar on all sides.