Narrated Abu Huraira:
Allah's Apostle said, "Allah said, "I have prepared for My Pious slaves things which have never been seen by an eye, or heard by an ear, or imagined by a human being." If you wish, you can recite this Verse from the Holy Quran:--"No soul knows what is kept hidden for them, of joy as a reward for what they used to do." (32.17)