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.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:4-1326b –
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السيوطي:٤-١٣٢٦b –

"عَنْ عَليٍّ فِى قَوْلِهِ {وَلَقَدْ آتَيْنَاكَ سَبْعًا مَنَ المَثَانِى والقُرآنَ العَظِيمَ قَالَ: هِىَ فَاتِحَةُ الكِتَابِ".  

الفريابى، [ص] سعيد بن منصور وابن الضرّيس في فضائله، وابن جرير، وابن المنذر، وابن أبى حاتم، وابن مردويه، [هب] البيهقى في شعب الإيمان

See similar narrations below:

Collected by Qurʾān
quran:15:87 –

And We have certainly given you, ˹O Muhammad˺, seven of the often repeated ˹verses˺ and the great Qur'an.  

And verily We have given you seven of the oft-repeated ˹verses˺ — the Prophet (s) said that this meant ˹sūrat˺ al-Fātiha, as reported by the two Shaykhs ˹Bukhārī and Muslim˺, since it is repeated in every unit of prayer (rak‘a) — and the great Qur’ān.
القرآن:١٥:٨٧ –

وَلَقَدْ آتَيْنَاكَ سَبْعًا مِنَ الْمَثَانِي وَالْقُرْآنَ الْعَظِيمَ  

{ولقد آتيناك سبعا من المثاني} قال ﷺ هي الفاتحة رواه الشيخان لأنها تثنى في كل ركعة {والقرآن العظيم}.