Ezekiel 46:21-23

21Then he brought me out to the outer courtyard and led me past the four corners of the courtyard. Behold, in every corner of the courtyard there was another courtyard.

22In the four corners of the courtyard there were enclosed courts, 40 cubits long by 30 wide—these four in the corners had the same size.

23There was a row of masonry surrounding them, surrounding the four. Boiling places were built under the surrounding rows.