صحیح ابن حبان
Ibn Hibban
كتاب الصوم
Book of Fasting
باب فضل رمضان - ذكر تفضل الله جل وعلا بمغفرة ما تقدم من ذنوب العبد بصيامه رمضان إذا عرف حدوده
Chapter on the Virtue of Ramadan - Allah’s grace in forgiving past sins for those who fast Ramadan and observe its limits
1 hadith
Hadith 3433
Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) narrates that the Prophet (peace and blessings of Allah be upon him) said: "Whoever fasts in Ramadan, safeguards its limits, and protects what should be protected, then his past sins are forgiven."