Exodus 38:1-2 English Standard Version (ESV)
Making the Altar of Burnt Offering
38 He made the altar of burnt offering of acacia wood. Five cubits[a] was its length, and five cubits its breadth. It was square, and three cubits was its height. 2 He made horns for it on its four corners. Its horns were of one piece with it, and he overlaid it with bronze.