Ezekiel 46:21-23

21Then he brought me out into the outer court and led me across to the four corners of the court; and behold, in every corner of the court there was a small court.

22In the four corners of the court there were enclosed courts, forty cubits long and thirty wide; these four in the corners were 1the same size.

23There was a row of masonry round about in them, around the four of them, and boiling places were made under the rows round about.