Sahih Muslim Book - 4, Hadith - 894

حَدَّثَنَا عَلِيُّ بْنُ حُجْرٍ السَّعْدِيُّ حَدَّثَنَا عَلِيُّ بْنُ مُسْهِرٍ أَخْبَرَنَا الْمُخْتَارُ بْنُ فُلْفُلٍ عَنْ أَنَسِ بْنِ مَالِكٍ ح و حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ وَاللَّفْظُ لَهُ حَدَّثَنَا عَلِيُّ بْنُ مُسْهِرٍ عَنْ الْمُخْتَارِ عَنْ أَنَسٍ قَالَ بَيْنَا رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ ذَاتَ يَوْمٍ بَيْنَ أَظْهُرِنَا إِذْ أَغْفَى إِغْفَاءَةً ثُمَّ رَفَعَ رَأْسَهُ مُتَبَسِّمًا فَقُلْنَا مَا أَضْحَكَكَ يَا رَسُولَ اللَّهِ؟ قَالَ أُنْزِلَتْ عَلَيَّ آنِفًا سُورَةٌ فَقَرَأَ بِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيمِ { إِنَّا أَعْطَيْنَاكَ الْكَوْثَرَ فَصَلِّ لِرَبِّكَ وَانْحَرْ إِنَّ شَانِئَكَ هُوَ الْأَبْتَرُ } ثُمَّ قَالَ أَتَدْرُونَ مَا الْكَوْثَرُ؟ فَقُلْنَا اللَّهُ وَرَسُولُهُ أَعْلَمُ قَالَ فَإِنَّهُ نَهْرٌ وَعَدَنِيهِ رَبِّي عَزَّ وَجَلَّ، عَلَيْهِ خَيْرٌ كَثِيرٌ هُوَ حَوْضٌ تَرِدُ عَلَيْهِ أُمَّتِي يَوْمَ الْقِيَامَةِ آنِيَتُهُ عَدَدُ النُّجُومِ فَيُخْتَلَجُ الْعَبْدُ مِنْهُمْ فَأَقُولُ رَبِّ إِنَّهُ مِنْ أُمَّتِي فَيَقُولُ مَا تَدْرِي مَا أَحْدَثَتْ بَعْدَكَ. زَادَ ابْنُ حُجْرٍ فِي حَدِيثِهِ: بَيْنَ أَظْهُرِنَا فِي الْمَسْجِدِ وَقَالَ: مَا أَحْدَثَ بَعْدَكَ.

It was narrated that Anas bin Malik said: "While the Messenger of Allah (s.a.w) was among us one day, he took a nap, then he raised his head and was smiling. We said: 'What has made you smile, O Messenger of Allah?' He said: 'Just now a Surah was revealed to me,' and he recited: 'Bismillahir-Rahmanir-Rahim (In the Name of Allah, the Most Gracious, the Most Merciful) "Verily, We have granted you (O Muhammad) Al-Kawthar. Therefore turn in prayer to your Lord and sacrifice. For he who hates you, he will be cut off.".' Then he said: 'Do you know what Al-Kawthar is?' We said: 'Allah and His Messenger know best.' He said: 'It is a river that my Lord, the Mighty and Sublime, has promised me, and there is much goodness in it. And it is a Hawd. (cistern) to which my Ummah will come on the Day of Resurrection, its vessels like the number of stars. A man will be turned away from it and I will say: "Lord, he is one of my Ummah.'' He will say: "You do not know what they innovated after you were gone.'' Ibn Hujr added in his Hadith: "(He) was among us in the Masjid.'' And he said: "What he innovated after you were gone."