Muslim, Abu Dawud and An-Nasa’i, all recorded from Anas radhiAllahu ‘anhu that he said, “While we were with the Messenger of Allah in the Masjid, he dozed off into a slumber. Then he lifted his head smiling. We said, ‘O Messenger of Allah! What has caused you to laugh?’ He said, ‘Verily, a Surah was just revealed to me.’ Then he recited,
إِنَّآ أَعْطَيْنَـكَ الْكَوْثَرَ – فَصَلِّ لِرَبِّكَ وَانْحَرْ – إِنَّ شَانِئَكَ هُوَ الاٌّبْتَرُ
‘Verily, We have granted you Al-Kauthar. Therefore, turn in prayer to your Lord and sacrifice. For he who hates you, he will be cut off.’
Then he said, ‘Do you all know what is Al-Kauthar?’ We said, ‘Allah and His Messenger know best.’ He said, ‘Verily, it is a river that my Lord, the Mighty and Majestic, has promised me and it has abundant goodness. It is a pond where my Ummah will be brought to on the Day of Judgment. Its containers are as numerous as the stars in the sky. Then a servant of Allah from among them will be (prevented from it) and I will say: “O Lord! Verily, he is from my Ummah (followers).” Then He (Allah) will say: “Verily, you do not know what he introduced (or innovated) after you.)” This is the wording of Muslim. Ahmad recorded this hadeeth from Muhammad bin Fudayl, who reported from Al-Mukhtar bin Fulful, who reported it from Anas bin Malik radhiAllahu ‘anhu .
Imam Ahmad also recorded from Anas radhiAllahu ‘anhu that the Messenger of Allah salAllahu ‘alayhi wa sallam said, “I entered Paradise and I came to a river whose banks had tents made of pearls. So I thrust my hand into its flowing water and found that it was the strongest (smell) of musk. So I asked, “O Jibreel! What is this?” He replied, “This is Al-Kawthar which Allah, the Mighty and Majestic has given you.” Al-Bukhari recorded this in his Saheeh, and so did Muslim, on the authority of Anas bin Malik. In their version Anas radhiAllahu ‘anhu said, “When the Prophet salAllahu ‘alayhi wa sallam was taken up to the heaven, he said, “I came to a river whose banks had domes of hollowed pearl. I said: “O Jibreel! What is this?” He replied: “This is Al-Kawthar.” This is the wording of Al-Bukhari.
Ahmad recorded from Anas that a man said, “O Messenger of Allah! What is Al-Kauthar?” He replied, “It is a river in Paradise which my Lord has given me. It is whiter than milk and sweeter than honey. There are birds in it whose necks are (long) like carrots.” `Umar said, “O Messenger of Allah! Verily, they (the birds) will be beautiful.” The Prophet replied, “The one who eats them (i.e., the people of Paradise) will be more beautiful than them, O `Umar.”
This Fountain will be granted to him on the Resurrection Day when there will be the cry of al-atash, al-atash (thirst, thirst!) on every side. The Prophet’s Ummah will gather together before him at it and will be watered thereby. He himself will be the first to arrive at it and will be occupying the central position.
He has said: “This is a Fountain at which my Ummah will assemble on the Resurrection Day.” (Muslim: Kitab as- Salat Abu Da’ud: Kitab as-Sunnah).
“I shall have arrived at the Fountain before you. ” (Bukhari: Kitab ar-Riqaq and Kitab al-Fitan; Muslim: Kitab al-Fida and Kitab at-Taharah; lbn Majah,: Kitab al Manasik and Kitab az-Zuhd. Musnad Ahmad: Marwiyyat `Abdullah bin Mas’ud `Abdullah bin `Abbas, Abu Hurairah.)
“I shall be there before you and shall bear witness on you, and by Allah, I am seeing my Fountain even at this time.” (Bukhari: Kitab al-jana-iz Kitab al-Maghazi, Kitab ar-Riqaq).
Addressing an assembly of the Ansar, the Prophet once said: “After me you will meet with selfishness and nepotism, endure it patiently until you meet me at the Fountain. ” (Bukhari: kitab Manaqib al-Ansar and Kitab al-Maghazi; Muslim: Kitab al-Iman; Tirmidhi:Kitab al-Fitan).