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 transgressions in regard to all their sins; and thus he shall do for the tent of meeting which abides 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, 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, and shall take some of the blood of the bull and of the blood of the goat and 2put it on the horns of the altar on all sides.