Ezekiel 40:10-12

10There were three guard alcoves on each side of the gateway passage. Each had the same measurements, and the dividing walls separating them were also identical.

11The man measured the gateway entrance, which was 17-1/2 feet wide at the opening and 22-3/4 feet wide in the gateway passage.

12In front of each of the guard alcoves was a 21-inch curb. The alcoves themselves were 10-1/2 feet on each side.