Read Ezekiel 40:5 Using Other Translations
And behold a wall on the outside of the house round about, and in the man's hand a measuring reed of six cubits long by the cubit and an hand breadth: so he measured the breadth of the building, one reed; and the height, one reed.
And behold, there was a wall all around the outside of the temple area, and the length of the measuring reed in the man's hand was six long cubits, each being a cubit and a handbreadth in length. So he measured the thickness of the wall, one reed; and the height, one reed.
I could see a wall completely surrounding the Temple area. The man took a measuring rod that was 10 feet long and measured the wall, and the wall was 10 feet thick and 10 feet high.