Ezekiel 43:16
The hearth is to be twelve cubits long and twelve cubits wide; that is, it will be a four-sided square.
Exodus 27:1
"You are to make the altar of acacia wood. It is to be five cubits long and five cubits wide; the altar is to be a square, and it is to be three cubits high.
Exodus 38:1-2
Then he made the altar for burnt offerings of acacia wood. It was a square, five cubits long and five cubits wide, and it was three cubits high.
2 Chronicles 4:1
Solomon also constructed a bronze altar 20 cubits long, 20 cubits wide, and ten cubits high.
Ezra 3:3
Even though they feared the people in neighboring regions, they rebuilt the altar where it had stood before. They offered burnt offerings on it to the LORD burnt offerings both in the morning and in the evening.