Exodus 38:1-7

He made the Altar of Whole-Burnt-Offering from acacia wood. He made it seven and a half feet square and four and a half feet high. He made horns at each of the four corners. The horns were made of one piece with the Altar and covered with a veneer of bronze. He made from bronze all the utensils for the Altar: the buckets for removing the ashes, shovels, basins, forks, and fire pans. He made a grate of bronze mesh under the ledge halfway up the Altar. He cast four rings at each of the four corners of the bronze grating to hold the poles. He made the poles of acacia wood and covered them with a veneer of bronze. He inserted the poles through the rings on the two sides of the Altar for carrying it. The Altar was made out of boards; it was hollow.