Sahih Bukhari Volume 9, Book 93, Number 525y:


Narrated Abu Huraira:

Allah's Apostle said, "If somebody gives in charity something equal to a date from his honestly earned money ----for nothing ascends to Allah except good---- then Allah will take it in His Right (Hand) and bring it up for its owner as anyone of you brings up a baby horse, till it becomes like a mountain." Abu Huraira said: The Prophet. said, "Nothing ascends to Allah except good.