Ezekiel 42:16-20

He measured on the east side with the measuring reed five hundred reeds, with the measuring reed round about. He measured on the north side five hundred reeds with the measuring reed round about. He measured on 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 on the four sides: it had a wall round about, the length five hundred, and the breadth five hundred, to make a separation between that which was holy and that which was common.