Sahih Al Bukhari – Book of Beginning Of Creation
Volumn 004, Book 054, Hadith Number 467.
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Narated By 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)
Junaid Tahir