Ezekiel 40:17-19

¹⁷Then brought he me into the outward court, and, lo, there were chambers, and a pavement made for the court round about: thirty chambers were upon the pavement. ¹⁸And the pavement by the side of the gates over against the length of the gates was the lower pavement. ¹⁹Then he measured the breadth from the forefront of the lower gate unto the forefront of the inner court without, an hundred cubits eastward and northward.