Ezekiel 42:15-20

Now when he had made an end of measuring the inner house, he brought me forth toward the gate whose prospect is toward the east, and measured it round about. He measured the east side with the measuring reed, five hundred reeds, with the measuring reed round about. He measured the north side, five hundred reeds, with the measuring reed round about. He measured the south side, five hundred reeds, with the measuring reed. He turned about to the west side, and measured five hundred reeds with the measuring reed. He measured it by the four sides: it had a wall round about, five hundred reeds long, and five hundred broad, to make a separation between the sanctuary and the profane place.