Ezekiel 42:15-20
15Then he had finished measuring the inner house; he brought me out by the way of the agate which faced toward the east and measured it all around. 16He measured on the east 1side with the measuring reed 500 reeds by the ameasuring reed. 17He measured on the north side 500 reeds by the measuring reed. 18On the south side he measured 500 reeds with the measuring reed. 19He turned to the west side and measured 500 reeds with the measuring reed. 20He measured it 1on the four sides; it had a awall all around, the blength 500 and the cwidth 500, to ddivide between the holy and the profane.