The Messenger of Allah ﷺ dozed for a short while and raised his smiling. He either said to them(people) or they said to him: Messenger of Allah! Why did you laugh? He said: A surah has been revealed to me just now, and then he recited: “In the name of Allah, Most Gracious. Most Merciful. To thee We have granted the fount (of abundance)” up to the end. When he recited, he asked: Do you know what al-kauthar is? They replied: Allah and his Apostle know best. He said: It is a river which my Lord, the Exalted, has promised me( to grant) in Paradise: there is abundance of good and upon it there is a pond which my people will approach on the Day of Resurrection. There are vessels as numerous as stars(in the sky).  

سَمِعْتُ أَنَسَ بْنَ مَالِكٍ يَقُولُ أَغْفَى رَسُولُ اللَّهِ ﷺ إِغْفَاءَةً فَرَفَعَ رَأْسَهُ مُتَبَسِّمًا فَإِمَّا قَالَ لَهُمْ وَإِمَّا قَالُوا لَهُ يَا رَسُولَ اللَّهِ لِمَ ضَحِكْتَ فَقَالَ إِنَّهُ أُنْزِلَتْ عَلَىَّ آنِفًا سُورَةٌ فَقَرَأَ بِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيمِ {إِنَّا أَعْطَيْنَاكَ الْكَوْثَرَ} حَتَّى خَتَمَهَا فَلَمَّا قَرَأَهَا قَالَ هَلْ تَدْرُونَ مَا الْكَوْثَرُ قَالُوا اللَّهُ وَرَسُولُهُ أَعْلَمُ قَالَ فَإِنَّهُ نَهْرٌ وَعَدَنِيهِ رَبِّي ﷻ فِي الْجَنَّةِ وَعَلَيْهِ خَيْرٌ كَثِيرٌ عَلَيْهِ حَوْضٌ تَرِدُ عَلَيْهِ أُمَّتِي يَوْمَ الْقِيَامَةِ آنِيَتُهُ عَدَدُ الْكَوَاكِبِ