Leviticus 16:16-18

16and he shall make atonement for the sanctuary, [to cleanse it] from the uncleanness of the children of Israel, and from their transgressions in all their sins; and so shall he do for the tent of meeting which dwelleth among them in the midst of their uncleanness.

17And there shall be no man in the tent of meeting when he goeth in to make atonement in the sanctuary until he come out; and he shall make atonement for himself, and for his house, and for the whole congregation of Israel.

18And he shall go out unto the altar which is before Jehovah, and make atonement for it; and shall take of the blood of the bullock, and of the goat, and put it upon the horns of the altar round about;