Ezekiel 43:16
And the altar is twelve long by twelve broad, square in its four squares.
Exodus 27:1
And thou hast made the altar of shittim wood, five cubits the length, and five cubits the breadth -- the altar is square -- and three cubits its height.
Exodus 38:1-2
And he maketh the altar of burnt-offering of shittim wood, five cubits its length, and five cubits its breadth (square), and three cubits its height;
2 Chronicles 4:1
And he maketh an altar of brass, twenty cubits its length, and twenty cubits its breadth, and ten cubits its height.
Ezra 3:3
And they establish the altar on its bases, because of the fear upon them of the peoples of the lands, and he causeth burnt-offerings to ascend upon it to Jehovah, burnt-offerings for the morning and for the evening.