Sahih Bukhari 37

Narrated Abu Huraira:

Allah's Messenger (ﷺ) said: "Whoever establishes prayers during the nights of Ramadan faithfully out of sincere faith and hoping to attain Allah's rewards (not for showing off), all his past sins will be forgiven."

Reference : Sahih-Bukhari 37
In Book Reference : Book 2, Hadith 30

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