Bukhari :: Book 1 :: Volume 2 :: Hadith 36
Narrated Abu Huraira:
Allah's Apostle said: "Whoever establishes prayers during the nights of Ramadan faithfully out of sincere faith and hoping to attain Allah's rewards (not for showing off), all his past sins will be forgiven."
Source materials are from the University of Southern California MSA site|
Hadith eBooks converted from Imaan Star