Ezekiel 43:16

And the hearth of God was twelve cubits long, by twelve broad, square in the four sides thereof.

Exodus 27:1

And thou shalt make the altar of acacia-wood, five cubits the length, and five cubits the breadth; the altar shall be square; and the height thereof three cubits.

Exodus 38:1-2

And he made the altar of burnt-offering of acacia-wood; five cubits the length thereof, and five cubits the breadth thereof, square, and three cubits the height thereof.

2 Chronicles 4:1

And he made a brazen altar: its length was twenty cubits, and its breadth twenty cubits, and its height ten cubits.

Ezra 3:3

And they set the altar on its base; for fear was upon them because of the people of the countries; and they offered up burnt-offerings on it to Jehovah, the morning and evening burnt-offerings.

Treasury of Scripture Knowledge

Summary

And the altar shall be twelve cubits long, twelve broad, square in the four squares thereof.

Square

Bible References

Twelve cubits

Exodus 27:1
And thou shalt make the altar of acacia-wood, five cubits the length, and five cubits the breadth; the altar shall be square; and the height thereof three cubits.
2 Chronicles 4:1
And he made a brazen altar: its length was twenty cubits, and its breadth twenty cubits, and its height ten cubits.
Ezra 3:3
And they set the altar on its base; for fear was upon them because of the people of the countries; and they offered up burnt-offerings on it to Jehovah, the morning and evening burnt-offerings.

Square

Exodus 38:1
And he made the altar of burnt-offering of acacia-wood; five cubits the length thereof, and five cubits the breadth thereof, square, and three cubits the height thereof.