Ezekiel 46:21-24

Then he brought me forth into the outer court, and caused me to pass by the four corners of the court; and, behold, in every corner of the court there was a court. In the four corners of the court there were courts inclosed, forty cubits long and thirty broad: these four in the corners were of one measure. And there was a wall round about in them, round about the four, and boiling-places were made under the walls round about. Then said he unto me, These are the boiling-houses, where the ministers of the house shall boil the sacrifice of the people.