'Horns of the Altar' in the Bible

So Moses slaughtered it, took the blood, and applied some of it at the horns of the altar and around it with his fingers, thus purifying the altar. Then he poured the blood at the base of the altar, thereby sanctifying it as a means to make atonement with it.

Next, Aaron's sons brought the blood to him and he dipped his fingers in the blood and placed it on the horns of the altar. As to the rest of the blood, he poured it at the base of the altar.

When he goes to the altar in the LORD's presence to make atonement for himself, he is to take some of the blood from the bull and the male goat, place it around the horns of the altar,