Exodus 38:2
And he made the horns thereof on the four corners of it; the horns thereof were of the same: and he overlaid it with brass. And he made the horns thereof on the four corners of it; the horns thereof were of the same: and he overlaid it with brass.
The bronze altar was the work of Bezalel, formed with horns rising on its four corners as one piece with the altar itself, and the whole was covered with brass. It stood before the tabernacle at Gibeon as the appointed place of approach to God. There it served for burnt offerings, where Solomon and the people sought the Lord and presented their sacrifices.