John Wesley on Ezra 6:3

Cubits - Those proportions differ from those of Solomon's temple, which was but thirty cubits high, only the porch was a hundred and twenty cubits high, and but twenty cubits in breadth. Either therefore Solomon's cubits were sacred cubits, which were larger than the other, and these but common cubits. Or, the sixty cubits of height are meant only for the porch. And the word rendered breadth, may be rendered the extension or the length of it; it being improbable that the king should give orders about the breadth, and none about the length of it.