Ezekiel 42:15-20

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