Ezekiel 40:21-22

21Its side rooms, three on either side, and its jambs and its vestibule were of the same size as those of the first gate. Its length was fifty cubits, and its breadth twenty-five cubits.

22And its windows, its vestibule, and its palm trees were of the same size as those of the gate that faced toward the east. And by seven steps people would go up to it, and find its vestibule before them.