The entrance was 20 cubits tall, 10 cubits wide: Eruvin 2a
The purpose of the Heichal's doors was to create privacy within: Eruvin 2b
The design atop the doorway: Eruvin 2b-3a
Placement of the initial, temporary walls, which were made of interwoven segments: Megillah 10a Personal benefit from the Inner Room: Pesachim 26a
The purpose of the room is internal, and so benefit from shade cast externally shouldn't be a problem of Illegal Use of Sanctified Property: Pesachim 26a
On the 17th of Tammuz an idol was set up [by the Jews] in this room: Taanit 26b
The Above was a major cause for the downfall of the Jews: Gittin 7a
The Babylonians entered this Room on the 7th of Av, in the Destruction of the First Temple: Taanit 29a
The Roman "Turnus Rufus" plowed over this room: Taanit 29a
The sources for the maximum size measurements of the entrance to an alley in which one may carry on Shabbat are the dimensions of the entrance to the "Heichal" room of the Temple or the "Ulam [Azarah]" room of the Temple: Eruvin 2a-3a
Functions of the Room
Could services meant for the Heichal be performed in the Azarah: Eruvin 2a
Laws
Removing an [impure] crawling creature found in this room during Shabbat: Eruvin 104b-105a
