サヒーフ・アル＝ブハーリー #35
Sahih (Authentic)
Allah's Messenger (ﷺ) said, "Whoever establishes the prayers on the night of Qadr out of sincere faith and hoping to attain Allah's rewards (not to show off) then all his past sins will be forgiven
伝承の連鎖（イスナード）
Narrated Abu Huraira