So he measured the area on all four sides. It had a wall all around, five hundred cubits long and five hundred cubits wide, to separate the holy from the common.
The entire area is enclosed by a wall five hundred cubits long and wide to separate the holy from the common.
This verse states the purpose of the surrounding wall and closes the chapter.
15Now when the man had finished measuring the interior of the temple area, he led me out by the gate that faced east, and he measured the area all around: 16With a measuring rod he measured the east side to be five hundred cubits long. 17He measured the north side to be five hundred cubits long. 18He measured the south side to be five hundred cubits long. 19And he came around and measured the west side to be five hundred cubits long. 20So he measured the area on all four sides. It had a wall all around, five hundred cubits long and five hundred cubits wide, to separate the holy from the common.