" مَنْ صَامَ رَمَضَانَ إِيمَانًا وَاحْتِسَابًا غُفِرَ لَهُ مَا تَقَدَّمَ مِنْ ذَنْبِهِ "
It was narrated from Abu Hurairah that the Prophet said: "Whoever fasts in Ramadan out of faith and in the hope of reward, he will be forgiven his previous sins." '