The entrance of the Heichal: Its height [was] twenty amos, and its width [was] ten amos. And it had four doors, two at the inside and two at the outside, as it is stated (Ezekiel 41:23): There were two doors to the Heichal and to the Holy [of Holies]. The outer [doors] opened into the entrance to cover the thickness of [the] wall, and the inner [doors] opened into the Heichal to cover [the area] behind the doors, for the entire Heichal was plated with gold, except for [the area] behind the doors.  R’ Yehudah says: [Both sets of doors] stood within the entranceway, and they were like an isteramita insofar as they folded back on themselves: the [outer doors occupied] two and a half amos and the [inner doors occupied] two and a half amos, [leaving] half an amah [for] the doorpost on this side and half an amah [for] the doorpost on this side; as it is stated (Ezekiel 41:24): There were two doors for [each one of] the doors, two swinging doors: two for one door and two doors for the other.