Sunan An Nasai 914

أَخْبَرَنَا إِسْمَاعِيلُ بْنُ مَسْعُودٍ قال:‏‏‏‏ حَدَّثَنَا خَالِدٌ، ‏‏‏‏‏‏قال:‏‏‏‏ حَدَّثَنَا شُعْبَةُ، ‏‏‏‏‏‏عَنْ خُبَيْبِ بْنِ عَبْدِ الرَّحْمَنِ قال:‏‏‏‏ سَمِعْتُ حَفْصَ بْنَ عَاصِمٍ يُحَدِّثُ، ‏‏‏‏‏‏عَنْ أَبِي سَعِيدِ بْنِ الْمُعَلَّى، ‏‏‏‏‏‏أَنّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَرَّ بِهِ وَهُوَ يُصَلِّي فَدَعَاهُ قَالَ:‏‏‏‏ فَصَلَّيْتُ، ‏‏‏‏‏‏ثُمَّ أَتَيْتُهُ فَقَالَ:‏‏‏‏ مَا مَنَعَكَ أَنْ تُجِيبَنِي قَالَ كُنْتُ أُصَلِّي قَالَ:‏‏‏‏ أَلَمْ يَقُلِ اللَّهُ عَزَّ وَجَلَّ يَأَيُّهَا الَّذِينَ آمَنُوا اسْتَجِيبُوا لِلَّهِ وَلِلرَّسُولِ إِذَا دَعَاكُمْ لِمَا يُحْيِيكُمْ سورة الأنفال آية 24 أَلَا أُعَلِّمُكَ أَعْظَمَ سُورَةٍ قَبْلَ أَنْ أَخْرُجَ مِنَ الْمَسْجِدِ قَالَ:‏‏‏‏ فَذَهَبَ لِيَخْرُجَ قُلْتُ يَا رَسُولَ اللَّهِ قَوْلَكَ قَالَ:‏‏‏‏ الْحَمْدُ لِلَّهِ رَبِّ الْعَالَمِينَ هِيَ السَّبْعُ الْمَثَانِي الَّذِي أُوتِيتُ وَالْقُرْآنُ الْعَظِيمُ .

It was narrated from Abu Sa'eed bin Al-Mu'alla that: The Prophet (ﷺ) passed by him when he was praying, and called him. He said: I finished praying, then I came to him, and he said: 'What kept you from answering me?' He said: 'I was praying.' He said: 'Does not Allah say: O you who believe! Answer Allah (by obeying Him) and (His) Messenger when he calls you to that which will give you life? Shall I not teach you the greatest surah before I leave the masjid?' Then he went to leave, and I said: 'O Messenger of Allah, what about what you said?' He said: All praise and thanks be to Allah, Lord of all that exists. These are the seven oft-recited that I have been given, and the Grand Quran.'