حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا غُنْدَرٌ، عَنْ شُعْبَةَ، عَنْ خُبَيْبِ بْنِ عَبْدِ الرَّحْمَنِ، عَنْ حَفْصِ بْنِ عَاصِمٍ، عَنْ أَبِي سَعِيدِ بْنِ الْمُعَلَّى، قَالَ قَالَ لِي رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " أَلاَ أُعَلِّمُكَ أَعْظَمَ سُورَةٍ فِي الْقُرْآنِ قَبْلَ أَنْ أَخْرُجَ مِنَ الْمَسْجِدِ " . قَالَ فَذَهَبَ النَّبِيُّ ـ صلى الله عليه وسلم ـ لِيَخْرُجَ فَأَذْكَرْتُهُ فَقَالَ " { الْحَمْدُ لِلَّهِ رَبِّ الْعَالَمِينَ} وَهِيَ السَّبْعُ الْمَثَانِي وَالْقُرْآنُ الْعَظِيمُ الَّذِي أُوتِيتُهُ " .
It was narrated that Abu Sa'eed bin Mu'alla said: "The Messenger of Allah(PBUH) said to me: 'Shall I not teach you the greatest Surah in the QUran before I leave the masjid?' Then the Propeht(PBUH) went to leave, so I reminded him, and he said: Al-hamdulillahi Rabbil-Alameen (All the praise is to Allah, the Lord of all that exists). It is the Seven Oft-Recited Verses, and it is the Grand Quran that has been given to me.'" Translation Not Available
Book Ref: Sunan Ibn Majah Book 33 Hadith 3785
Web Ref: Sunan Ibn Majah Vol 5 Book 33 Hadith 3785