110 Hadith Qudsi, Chapter: 110 Ahadith Qudsi (Sacred Hadith)

Prophet Muhammad (SAW) one day took a nap among us and woke up laughing. We asked him: O Messenger (PBUH) of Allah, why did you smile. The Prophet (SAW) said: A Surah was revealed to me before. Then he read out:"In the Name of Allah, the Most Beneficent, the Most Merciful", "Verily, We have granted you (O Muhammad (SAW)) Al-Kauthar (a river in Paradise). Therefore, turn in prayer to your Lord and sacrifice (to Him only). For, he who makes you angry (O Muhammad (SAW)) will be cut off" (Sweat Al-Kauthar) Then the Prophet (SAW) asked: Do you know what Al-Kauthar is? The narrator said we said: Allah and His Messenger (PBUH) know best. Then the Prophet (SAW) said: It is a river in Paradise Allah pledged to give me. It is full of every thing good and my Ummah will aim at it on the Day of Resurrection. Its cups are as many as stars. Some of my followers will be prevented from it and I will ask O my Lord they are my followers. Allah will say: You (O Muhammad (SAW)) do not know how they took to heterodoxy after you). (This Hadith is sound and reported by Muslim, Abu Daud and Nasai).