Ezekiel 43:13-15

13“These are the measurements of the altar in units of length (each unit being the standard length plus three inches): The gutter is 21 inches deep and 21 inches wide, with a rim of nine inches around its edge. This is the base of the altar.

14The distance from the gutter on the ground to the lower ledge is 3½ feet, and the width of the ledge is 21 inches. There are 7 feet from the small ledge to the large ledge, whose width is also 21 inches.

15The altar hearth is 7 feet high, and four horns project upward from the hearth.