´It was narrated from Abu Hurairah that the Messenger of Allah (ﷺ) said:` ‘Whoever fasts Ramadan out of faith and the hope of reward will be forgiven his previous sins.”
Hadith ReferenceSunan Ibn Majah / The Book of Fasting / Hadith: 1641
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:بخاري ومسلم