From the front of the gate at the entrance to the front of the inner vestibule of the gate was fifty cubits.
The measuring-reed which was in the hand of the surveyor-general was mentioned before, Eze 40:3. Here we are told (Eze 40:5) what was the exact length of it, which must be observed, because the house was measured by it. It was six cubits long, reckoning, not by the common cubit, but the cubit of the sanctuary, the sacred cubit, by which it was fit that...
Commenting on Ezekiel 40:5-26
And from the face of the gate of the entrance,.... That is, from the outward gate as you went into the porch, and was to the east, so called from people's passing and repassing (b) in it; so Jarchi takes it to be the eastern gate; the Targum calls it the middle gate: unto the face of the porch of the inner gate; which opened...
Fifty cubits - The length of the building. See MMMMM in the plan.