Ezekiel 43:16
The altar hearth shall be twelve [cubits] long by twelve broad, square in the four sides of it.
Exodus 27:1
"You shall make the altar of acacia wood, five cubits long, and five cubits broad; the altar shall be foursquare: and its height shall be three cubits.
Exodus 38:1-2
He made the altar of burnt offering of acacia wood. It was square. Its length was five cubits, its breadth was five cubits, and its height was three cubits.
2 Chronicles 4:1
Then he made an altar of brass, twenty cubits its length, and twenty cubits its breadth, and ten cubits its height.
Ezra 3:3
They set the altar on its base; for fear was on them because of the peoples of the countries: and they offered burnt offerings thereon to Yahweh, even burnt offerings morning and evening.