Ezekiel 40:21-22

21Its gate chambers, three on this side and three on that side, its gateposts and its archways, had the same measurements as the first gate; its length was fifty cubits and its width twenty-five cubits.

22Its windows and those of its archways, and also its palm trees, had the same measurements as the gateway facing east; it was ascended by seven steps, and its archway was in front of it.