Hadithcore
Riyad as-Salihin, 1009

Abu Sa'id Ar-Rafi' bin Al-Mu'alla (May Allah be pleased with him) reported:

The Messenger of Allah (ﷺ) said, "Shall I teach you the greatest Surah in the Qur'an before you leave the mosque?" Then he (ﷺ), took me by the hand, and when we were about to step out, I reminded him of his promise to teach me the greatest Surah in the Qur'an. He (ﷺ) said, "It is 'Alhamdu lillahi Rabbil 'Alamin (i.e., Surat Al-Fatihah) which is As-Sab' Al-Mathani (i.e., the seven oft- repeated Ayat) and the Great Qur'an which is given to me." <b>[Al-Bukhari]</b>.

عن أبي سعيد رافع بن المعلى رضي الله عنه قال ‏:‏ قال لي رسول الله صلى الله عليه وسلم ‏:‏‏"‏ألا أعلمك أعظم سورة في القرآن قبل أن تخرج من المسجد‏؟‏ فأخذ بيدي ، فلما أردنا أن نخرج قلت ‏:‏ يا رسول الله إنك قلت لأعلمنك أعظم سورة في القرآن ‏؟‏ قال‏:‏ ‏"‏الحمد لله رب العالمين هي السبع المثاني، والقرآن العظيم الذي أوتيته ‏"‏‏.‏ ‏(‏‏(‏رواه البخاري‏)‏‏)‏‏.‏

References1 variant
In-Book Reference
Book 8, Hadith 19
Sharh · explanationclick to expand
<b>Guidance from the Hadith:</b><br> 1) Surat al-Fātihah is the greatest Surah in the Qur’an, for it is the Mother of the Book, and all the meanings of the Qur’an refer back to this Surah.<br> 2) It was called the seven oft-repeated verses because it consists of seven verses, which are recited in each Rak‘ah in every prayer.<br> 3) The Prophet (may Allah’s peace and blessings be upon him) attracted his Companions’ hearts by benefiting them and teaching them in a good way. Look how he took that Companion by the hand and walked with him to the mosque’s door. Such attitude creates harmony and love.
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