Ezekiel 42:16-20

He measured on the east side with the measuring reed five hundred reeds by the measuring reed. He measured on the north side five hundred reeds by the measuring reed. On the south side he measured five hundred reeds with the measuring reed. He turned to the west side and measured five hundred reeds with the measuring reed. He measured it on the four sides; it had a wall all around, the length five hundred and the width five hundred, to divide between the holy and the profane.