Ezekiel 40:10-12

10The guardrooms of the gate toward the east numbered three on each side; the three of them had the same measurement. The side pillars also had the same measurement on each side.

11And he measured the width of the 1gateway, ten cubits, and the length of the gate, thirteen cubits.

12There was a 2barrier wall one cubit wide in front of the guardrooms on each side; and the guardrooms were six cubits square on each side.