Ezekiel 42:15-20

15When he had finished measuring what was inside the temple area, he led me out by the east gate and measured the area all around: 16He measured the east side with the measuring rod; it was five hundred cubits. 17He measured the north side; it was five hundred cubits by the measuring rod. 18He measured the south side; it was five hundred cubits by the measuring rod. 19Then he turned to the west side and measured; it was five hundred cubits by the measuring rod. 20So he measured the area on all four sides. It had a wall around it, five hundred cubits long and five hundred cubits wide, to separate the holy from the common.