" مَنْ قَامَ رَمَضَانَ إِيمَانًا وَاحْتِسَابًا غُفِرَ لَهُ مَا تَقَدَّمَ مِنْ ذَنْبِهِ "
It was narrated from Abu Hurairah that the Messenger of Allah said: "Whoever spends the night of Ramadan in prayer (Qiyam) out of faith and in the hope of reward, he will be forgiven his previous sins." '