Ezekiel 42:15-20

Now when he had finished measuring the interior of the temple area, he led me out by the gate that faced east, and measured the temple area all around. He measured the east side with the measuring reed, 500 cubits by the measuring reed all around. He measured the north side, 500 cubits by the measuring reed all around. He measured the south side, 500 cubits by the measuring reed. Then he turned to the west side and measured, 500 cubits by the measuring reed. He measured it on the four sides. It had a wall around it, 500 cubits long and 500 cubits broad, to make a separation between the holy and the common.