The Book Pertaining to Paradise, Its Description, Its Bounties and Its Intimates (Kitab Al-Jannat wa Sifat Na'imiha wa Ahliha)
Muslim :: Book 40 : Hadith 6782
Abu Huraira reported Allah's Messenger (may peace be upon him) said that Allah, the Exalted and Glorious, said: I have prepared for My pious servants which the eye has seen not, and the ear has heard not and no human heart has ever perceived such bounties leaving aside those about which Allah has informed you. He then recited:" No soul knows what comfort has been hidden for thein".