مَنْ صَامَ رَمَضَانَ إِيمَانًا وَاحْتِسَابًا غُفِرَ لَهُ مَا تَقَدَّمَ مِنْ ذَنْبِهِ
Transliteration
Man sama Ramadana imanan wa-htisaban ghufira lahu ma taqaddama min dhanbih.
Translation
Whoever fasts Ramadan out of faith and seeking reward, his previous sins are forgiven.
Narrated by Abu Hurayrah·Sahih al-Bukhari 38, Sahih Muslim 760
