Ezekiel 40:10-12

10In the eastern gateway were three gate chambers on one side and three on the other; the three were all the same size; also the gateposts were of the same size on this side and that side.

11He measured the width of the entrance to the gateway, ten cubits; and the length of the gate, thirteen cubits.

12There was a space in front of the gate chambers, one cubit on this side and one cubit on that side; the gate chambers were six cubits on this side and six cubits on that side.