From How Many Doors Was the Quran Revealed?
بَابٌ: مِنْ كَمْ أَبْوَابٍ نُزِّلَ الْقُرْآنُ
Sunan an-Nasa'i al-Kubra, Book of Virtues of the Qur'ān(view book)
Sunan an-Nasa'i al-Kubra 7930
ʿAmr b. ʿAlī > Ibn Dāwud > Sufyān > al-Walīd b. Qays > al-Qāsim b. Ḥassān > Fulfulah b. ʿAbdullāh al-Juʿfī > ʿAbdullāh / Ibn Masʿūd
"The books descended from one gate, and the Quran descended from seven gates, upon seven characters/letters."
أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ قَالَ حَدَّثَنَا ابْنُ دَاوُدَ قَالَ أَخْبَرَنَا سُفْيَانُ عَنِ الْوَلِيدِ بْنِ قَيْسٍ عَنِ الْقَاسِمِ بْنِ حَسَّانَ عَنْ فُلْفُلَةَ بْنِ عَبْدِ اللهِ الْجُعْفِيِّ قَالَ قَالَ عَبْدُ اللهِ وَهُوَ ابْنُ مَسْعُودٍ
«نَزَلَتِ الْكُتُبُ مِنْ بَابٍ وَاحِدٍ وَنَزَلَ الْقُرْآنُ مِنْ سَبْعَةِ أَبْوَابٍ عَلَى سَبْعَةِ أَحْرُفٍ»
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