Once a year Aaron shall make atonement on the horns of the altar. Throughout your generations he shall make atonement on it annually with the blood of the sin offering of atonement. The altar is most holy to the LORD."

Hebrews 9:7
But only the high priest entered the second room, and then only once a year, and never without blood, which he offered for himself and for the sins the people had committed in ignorance.

Revelation 9:13
Then the sixth angel sounded his trumpet, and I heard a voice from the four horns of the golden altar before God

Exodus 30:9
On this altar you must not offer unauthorized incense or a burnt offering or grain offering; nor are you to pour a drink offering on it.

Exodus 30:11
Then the LORD said to Moses,

Leviticus 16:2
And the LORD said to Moses: "Tell your brother Aaron not to enter freely into the Most Holy Place behind the veil in front of the mercy seat on the ark, or else he will die, because I appear in the cloud above the mercy seat.

Leviticus 16:16
So he shall make atonement for the Most Holy Place because of the impurities and rebellious acts of the Israelites in regard to all their sins. He is to do the same for the Tent of Meeting which abides among them, because it is surrounded by their impurities.

Leviticus 16:18
Then he shall go out to the altar that is before the LORD and make atonement for it. He is to take some of the bull's blood and some of the goat's blood and put it on all the horns of the altar.

Leviticus 23:27
"The tenth day of this seventh month is the Day of Atonement. You shall hold a sacred assembly and humble yourselves, and present an offering made by fire to the LORD.

1 Kings 1:50
But Adonijah, in fear of Solomon, got up and went to take hold of the horns of the altar.

1 Chronicles 6:49
But Aaron and his sons did all the work of the Most Holy Place. They presented the offerings on the altar of burnt offering and on the altar of incense to make atonement for Israel, according to all that Moses the servant of God had commanded.

And Aaron shall make an atonement on the horns of it once in a year with the blood of the sin offering of atonements: once in the year shall he make atonement on it throughout your generations: it is most holy to the LORD.