Ezekiel 42:15-20

And he completed the measurements of the inner temple, and he brought me to the walkway of the gate that faces toward the east and he measured it all the way around. He measured the east side with the reed for measuring, five hundred cubits, with respect to reeds with the reed for measurement, he measured it all around. He measured the north side as five hundred cubits, with respect to reeds with the reed for measurement all around. Then he measured the south side as five hundred cubits, with respect to reeds with the reed for measurement. He went around the west side and he measured five hundred cubits, with respect to reeds with the reed for measurement. Toward the four sides he measured it; there was a wall for it all the way around. Its length was five hundred cubits and its width was five hundred cubits, in order to make a separation between what is holy and what is common.