Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
suyuti:430-132bIbn Masʿūd
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السيوطي:٤٣٠-١٣٢bعَنِ ابْنِ مَسْعُودٍ قَالَ

"إِنَّ الْقُرْآنَ أُنزلَ عَلَى نَبِيِّكُمْ مِنْ سَبْعَة أَبْوابٍ عَلَى سَبْعَةِ أَحْرُفٍ، وَإِنَّ الكتَابَ قَبْلَكُمْ كَانَ يَنْزلُ منْ بَابٍ وَاحِدٍ عَلَى حَرْفٍ وَاحِدٍ".  

ابن أبى داود، [كر] ابن عساكر في تاريخه

See similar narrations below:

Collected by Nasāʾī's Kubrá
nasai-kubra:7930ʿAmr b. ʿAlī > Ibn Dāwud > Sufyān > al-Walīd b. Qays > al-Qāsim b. Ḥassān > Fulfulah b. ʿAbdullāh al-Juʿfī > ʿAbdullāh / Ibn Masʿūd

[Machine] "The books descended from one gate, and the Quran descended from seven gates, upon seven characters/letters."  

الكبرى للنسائي:٧٩٣٠أَخْبَرَنَا 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»