ثاني أهم بابين مغلقين في السور الجنوبي للمسجد الأقصى بعد الباب الثلاثي، يقع على بعد 80 مترا إلى الغرب من الباب الثلاثي، تحت محراب الجامع القبلي بالضبط، وهو بذلك يشكل مدخلاً من القصور الأموية التي كانت قائمة جنوب المسجد الأقصى إلى الجامع القِبْلي عبر ممر مزدوج يوجد أسفل الجامع كان قديماً ممراً للأمراء الأمويين، وأصبح الآن مصلى اسمه "الأقصى القديم".

والباب المزدوج مكون من بوابتين، كما يوضح اسمه، تقودان إلى رواقين. وعناصر بنائه تؤكد أن الأمويين هم من بنوه، ويرجح أن يكون ذلك في زمن عبد الملك بن مروان، ومن ثمّ ابنه الوليد، وهو ما يدحض ادعاءات اليهود بشأنه حيث يدّعون أنه من بناء سليمان أو الملك هيرودس.

والغالب أن الباب المزدوج مغلق بأمر السلطان الناصر صلاح الدين الأيوبي لحماية المسجد والمدينة من الغزاة.

وجاء إغلاقه بطريقة مميزة حيث بنى صلاح الدين مدرسة سميت بالزاوية الختنية، نسبة إلى شيخها الختني، داخل المبنى البارز خارج السور الجنوبي للمسجد الأقصى والمعروف بالبرج، لتحيط بالباب من الخارج، وأوقفها في عام 587هـ/1191م.

ويدلف إلى هذه المدرسة نزولا بدرجات يقود إليها مدخل يقع على يمين محراب الجامع القِبْلي، غربي المنبر. كما يمكن الوصول إليها عبر الباب المزدوج من داخل الأقصى، وتحديدا من داخل مصلى الأقصى القديم الواقع أسفل الجامع القِبْلي.

The second most important of the three closed gates in the southern wall of Al-Aqsa Masjed after the Triple Gate. It is located 80 meters to the west of the Triple Gate, exactly under the niche of the Al-Qibli Masjed. Thus, it constitutes an entrance from the Umayyad palaces that existed south of Al-Aqsa Masjed to the Al-Qibli Masjed via a double corridor located below the Masjed. In the past, it was a passage for the Umayyad princes, and later was altered to a prayer hall called "the ancient Aqsa".

The double gate consists of two entrances, as its name indicates, leading to two aisles. Therefore, the elements of its construction confirm that the Umayyad has built it, and it is likely that this was during the time of Abd al-Malik ibn Marwan, and then his son al-Walid. This attribution refutes the claims of the Jews that it was built by Solomon or King Herod.

It is likely that the double door was sealed by the order of Sultan Al-Nasir Salah Al-Din the Ayyubid to protect the Masjed and the city of Jerusalem from invaders. The closure of the gate came in a distinctive way, as Salah al-Din built a school called the al-Zawiya al-Khatniyyah, after its Sheikh al-Khatni, inside the prominent building outside the southern wall of Al-Aqsa Masjed, known as the Tower, to surround the gate from the outside, and he endowed it in the year 587 AH / 1191 AD.

The school can be accessed by steps leading down to an entrance located to the right of the al-Qibli Masjed’s niche, to the west of the pulpit. It enters this madrasah down by steps leading to an entrance located to the right of the al-Qibli Masjed’s mihrab, to the west of the minbar. It can also be accessed via the double gate from inside Al-Aqsa, specifically from inside the Ancient Aqsa Chapel located below the Al-Qibli Masjed.

Mescid-i Aksâ'nın kapalı kapılarından birisidir. İkiz iki kapıdan oluşmaktadır. Mescid-i Aksâ’nın güney surlarında yer alan kapı, minberin tam arkasında olup eğimli koridorlardan geçerek Kıble Mescidi'nin alt tarafına ulaşılmaktadır. Sülâsî kapısına 80 metre uzaklıktadır. Çok eski bir kapı olup tarihi Bizans Dönemi’ne dayanmaktadır. Bu kapıya verilen isimlerden bazıları şunlardır: Sonsuzluk Kapısı, Kadim Aksâ Kapısı, Nebî Kapısı.