Ezekiel 43:12-13

“This is the law of the temple: the mountaintop radiates his glory, therefore, all around the Temple Mount will be a most holy area. Behold, this is the most important law of the temple.” “This is the measurement of the altar using the same unit of measurement as the rest of the temple: The base is one cubit high and one cubit wide, with a rim of one span around its edge. The altar itself is to be this high