Riyad as-SalihinChapter 8Hadith 540
Full Sharh — Riyad as-Salihin 540
وعن أبي هريرة رضي الله عنه عن النبي صلى الله عليه وسلم قال: من صام رمضان إيمانًا واحتسابًا، غفر له ما تقدم من ذنبه " ((متفق عليه))
English Translation
Abu Hurairah (May Allah be pleased with him) reported:: The Prophet (ﷺ) said, "He who observes fasting during the month of Ramadan with Faith while seeking its reward from Allah, will have his past sins forgiven.".
Source
Riyad as-Salihin(رياض الصالحين)
The Book of Virtues
Hadith Number
540