The Book of Prayers (Kitab Al-Salat)

Muslim :: Book 4 : Hadith 1665

Abu Huraira reported Allah's Apostle (may peace be upon him) as saying: He who prayed on the Lailat-ul-Qadr (the Majestic Night) knowing that it is (the same night). I (believe) that he (the Holy Prophet also) said: (He who does) it with faith and seeking reward (from Allah), his sins would be forgiven.

Source materials are from the University of Southern California MSA site
Hadith eBooks converted from Imaan Star