Then he measured the gateway from the top of the rear wall of one alcove to the top of the opposite one; the distance was twenty-five cubits from one parapet opening to the opposite one.
NIV
And the man [an angel] measured the gate from the outer wall of one chamber or guardroom to the outer wall of another--a breadth of twenty-five cubits from door to door.
AMP
He measured then the gate from the roof of one little chamber to the roof of another: the breadth was five and twenty cubits, door against door.
KJV