Ezekiel 42:7-9

7And the wall that was outside by the side of the chambers, toward the outer court on the forepart of the chambers, the length of it was fifty cubits.

8For the length of the chambers that were in the outer court was fifty cubits: and, lo, before the temple were an hundred cubits.

9And from under these chambers was the entrance on the east side, as one goeth into them from the outer court.123