Hadith About Night Prayer
Abu Hurairah (RA) narrated that: the Messenger of Allah (peace be upon him) said: "Whoever fasts Ramadan and stands (in the night prayer) for it out of faith and seeking a reward (from Allah), he will be forgiven what preceded of his sins. Whoever stands (in the night prayer) on the Night of Al-Qadr out of faith and seeking a reward (from Allah), he will be forgiven what preceded of his sins." (Jami`at-Tirmidhi, Book 8, Hadith 2)