10
"Aaron shall amake atonement on its horns once a year; he shall make atonement on it with the blood of the sin offering of atonement once a year throughout your generations. It is most holy to the Lord."
a
Leviticus 16:18
Leviticus 16
18
"Then 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 aput it on the horns of the altar on all sides.