Yechezkel 41:9-11

Orthodox Jewish Bible

⁹ The thickness of the wall, which was for the tzela toward the outside, was five cubits; and that which was open was the space at the end of the tzela’ot of the Beis [HaMikdash].

¹⁰ And between the leshakhot was the space the width of twenty cubits around the Beis [HaMikdash] all around.

¹¹ And the petach of the tzela were toward the space that was open, one petach toward the north, and another petach toward the south; and the width of the place that was open was five cubits all around.