Now these are the things in which Solomon was instructed for the building of the house of God. The length by cubits according to the old cubit was threescore cubits, and the breadth twenty cubits.
All Commentaries on 2 Chronicles 3:3 Go To 2 Chronicles 3
George Leo Haydock
By the first, or ancient measure, used before the captivity. The Babylonian cubit was a hand smaller, as Ezechiel (xl. 3.) intimates. (Calmet)
Solomon used the same cubit as Moses, but doubled the proportions. (Menochius)