Ezekiel 42:7-9

7And 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.

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

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