Ezekiel 40:17-19

17Then he brought me into the 1outer courtyard, and behold, there were 2chambers and a stone pavement made for the courtyard all around; thirty chambers 3faced the pavement. 18And the pavement (that is, the lower pavement) was by the 4side of the gates, corresponding to the length of the gates. 19Then he measured the width from the front of the 5lower gate to the front of the exterior of the inner courtyard, a 6hundred cubits on the east and on the north.