Ezekiel 40:8, 10, 13, 15, 25, 29
Ezekiel 40:10 ESV
And there were three side rooms on either side of the east gate. The three were of the same size, and the jambs on either side were of the same size.
Ezekiel 40:15 ESV
From the front of the gate at the entrance to the front of the inner vestibule of the gate was fifty cubits.
Ezekiel 40:25 ESV
Both it and its vestibule had windows all around, like the windows of the others. Its length was fifty cubits, and its breadth twenty-five cubits.