Middos 3:8 - 4:1

שלא יבעטו (so that the walls would not bulge)- so that the walls would not bend/incline to fall from the weight of their height, and these [cedar] beams would continue from this wall to that wall support the two walls (of the hall containing the golden altar and the hall leading to the interior of the Temple).

ורואין את העטרות – in the windows of the hall containing the golden altar (i.e., Hekhal).

כל מי שהוא מתנדב – [donating] gold to the hall containing the golden altar (i.e., Hekhal), and he wants that the gold that he donated will be placed in the Heikhal because it was entirely covered in gold., he made from that gold that he donates in the image of a single berry or a leaf or a cluster [of grapes] and hangs it on it.

ונמנו עליה שלש מאות כהנים – because of the heaviness of the gold was great that was there, three-hundred Kohanim were needed to carry it and to remove it from place to place. And this is one of the places tha,t the Sages spoke of in the language of exaggeration in rhetorical speech (see Talmud Hullin 90b), and not exactly three-hundred Kohanim, but Rabbi Eliezer B’Rabbi Tzadok did not intend other than to inform that there was a lot of gold that was donated there.

פתחו של היכל. שתים בפנים – in the thickness of the wall that is towards the inside.

ושתים בחוץ – in the thickness towards the outside, for the thickness of the wall of the hall leading to the golden altar (Hekhal) was six cubts, and at the end of the outer cubit of the thickness of the wall, there were the outer doors, one to the right of the opening and one to the left, each of these doors was five cubits wide, and when they were locked, the would touch each other and close the width of the cavity of the opening whose width was ten cubits, and when they were opened towards the inside, they cover five cubits of the thickness of the walls. But two other doors were like these measurements which were fixed at the end of the thickness of the walls towards the inner side, and when they were opened, they cover five cubits from here and five cubits from there from the width of the wall of the sanctuary/Heikhal inside, and there was no wall plastered with gold like in the rest of the Temple, because it was not visible.

אצטברמיטה (pivots, pins at top and bottom of a door turning in sockets) – boards of joints attached on the handles of the links and they are opened, and when he desires, they are bent and folded one on top of the other. Such were all of these doors, whether towards the inside or towards the outside, which were attached through these links, and at the end, one-half a cubit of the thickness of the wall they were fixed, between the doors that are inside and those that are outside, and five cubits of the thickness of the wall interrupt between the outer doors to the inner doors. But each door was five cubits attached from the two boards; each board was two-and one-half cubits, and when the outer door opened towards the inside, its half was bent and folded one on top of the other, and covers from the thickness of the wall two-and half cubits, and similarly, the door that is fixed on the inside, when it is opened to the outer side, it also was bent and folded and covers the two-and -one-half cubits that remained from the thickness of the wall.

שנאמר ושתים דלתות לדלתות שתים – so we see that each and every door was divided into two.