Ezekiel 43:17

The second tier was 14 cubits (23 feet 4 inches) square. It too had a curb around its upper edge that formed a gutter, and that curb was half a cubit high (10 inches, cf. Ezekiel 43:13). There were to be steps up to the altar from the east. Formerly the Lord had forbidden the use of steps leading up to His altars (Exodus 20:24; Exodus 20:26). The total size of this altar was about 18 cubits (30 feet) square at the bottom, 20 feet square at the top, and 16 feet 8 inches high. Solomon’s brazen altar had been smaller (cf. 2 Chronicles 4:1). This design made this altar resemble a small ziggurat.