Riyad as-Salihin, Book 9, Hadith 1189 (In-Book) ⓘ
Abu Hurairah (May Allah be pleased with him) reported: The Prophet said, "Whosoever performs Qiyam during Lailat-ul-Qadr (Night of Decree), with Faith and being hopeful of Allah's reward, will have his former sins forgiven."[Al-Bukhari and Muslim].
وعن أبي هريرة رضي الله عنه، عن النبي صلى الله عليه وسلم قال: "من قام ليلة القدر إيمانا واحتسابًا غفر له ما تقدم من ذنبه" . ((متفق عليه)) .