Exodus 38:1-7

They built the altar of burnt offering of acacia wood, three cubits high; it was square, five cubits long and five cubits wide. They made a horn at each of the four corners, so that the horns and the altar were of one piece, and they overlaid the altar with bronze. They made all its utensils of bronze—its pots, shovels, sprinkling bowls, meat forks and firepans. They made a grating for the altar, a bronze network, to be under its ledge, halfway up the altar. They cast bronze rings to hold the poles for the four corners of the bronze grating. They made the poles of acacia wood and overlaid them with bronze. They inserted the poles into the rings so they would be on the sides of the altar for carrying it. They made it hollow, out of boards.