Ezekiel 42:5-9

Now the upper chambers were shorter: for the galleries were higher than these, than the lower, and than the middlemost of the building.

For they were in three stories, but had not pillars as the pillars of the courts: therefore the building was straitened more than the lowest and the middlemost from the ground.

And the wall that was without over against the chambers, toward the utter court on the forepart of the chambers, the length thereof was fifty cubits.

For the length of the chambers that were in the utter court was fifty cubits: and, lo, before the temple were an hundred cubits.

And from under these chambers was the entry on the east side, as one goeth into them from the utter court.