مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 2373
Supplications
Chapter - Section 1
وَعَنْ أَبِي سَعِيدٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: إِذَا أَسْلَمَ الْعَبْدُ فَحَسُنَ إِسْلَامُهُ يُكَفِّرُ اللَّهُ عَنْهُ كُلَّ سَيِّئَةٍ كَانَ زَلَفَهَا وَكَانَ بَعْدَ الْقِصَاصِ: الْحَسَنَةُ بِعَشْرِ أَمْثَالِهَا إِلَى سَبْعِمِائَةِ ضِعْفٍ إِلَى أَضْعَافٍ كَثِيرَةٍ وَالسَّيِّئَةُ بِمِثْلِهَا إِلَّا أَنْ يَتَجَاوَزَ اللَّهُ عَنْهَا . رَوَاهُ البُخَارِيّ
Abu Sa'id reported God’s messenger as saying, “When a man accepts Islam sincerely God removes from him every sin he has previously committed. After that there will be requital, a good deed getting ten to seven hundred times as much and many times more, and an evil deed getting a punishment equivalent to it, unless God overlooks it.” Bukhari transmitted it.
Mishkat al-Masabih, 2373صَحِيحٌ (الألباني)