the Messenger of Allah 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."
Reference: Jami` at-Tirmidhi 683 In-book : Book 8, Hadith 2 English translation : Vol. 2, Book 3, Hadith 683
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