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:4-435bʿLy > Suʾil > Fātiḥah al-Kitāb > Nabī Allāh ﷺ
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السيوطي:٤-٤٣٥b

"عن عليٍّ: أَنَّهُ سُئِلَ عَنْ فَاتِحَةِ الْكِتَابِ فَقَالَ: حَدَّثَنَا نَبِيُّ الله ﷺ أَنَّهَا أْنزِلَتْ مِنْ كَنْزٍ تَحْتَ الْعَرْشِ".  

ابن راهويه

See similar narrations below:

Collected by Suyūṭī