Exodus 38:1-7

He made the altar of burnt offering of acacia wood; five cubits was its length and five cubits its width—it was square—and its height was three cubits. He made its horns on its four corners; the horns were of one piece with it. And he overlaid it with bronze. He made all the utensils for the altar: the pans, the shovels, the basins, the forks, and the firepans; all its utensils he made of bronze. And he made a grate of bronze network for the altar, under its rim, midway from the bottom. He cast four rings for the four corners of the bronze grating, as holders for the poles. And he made the poles of acacia wood, and overlaid them with bronze. Then he put the poles into the rings on the sides of the altar, with which to bear it. He made the altar hollow with boards.