John Gill Commentary Ezekiel 41:3

"Then went he inward, and measured each post of the entrance, two cubits; and the entrance, six cubits; and the breadth of the entrance, seven cubits." — Ezekiel 41:3 (ASV)

Then went he inward
Through the temple or holy place he had measured, to the holy of holies: and measured the post of the door two cubits ;
this was the door into the most holy place; there was one in Solomon's temple; but in the second temple there was none; but two rails instead of it, which were rent at the death of Christ; and two cubits was the thickness of the post, on which this door was shut: and the door six cubits, and the breadth of the door seven cubits ;
this door was a two leaved one; each leaf consisted of three cubits broad, and the post in the middle on which they shut one cubit broad, which made seven: though some think that the side walls of the door are meant, as in (Ezekiel 41:2) , which were each seven cubits; and the breadth of the door, six cubits, made twenty cubits; which was the breadth of the most holy place, as answering to the breadth of the holy place, as in the next verse.