أِبُوْ هُرَيْرَةَ رَضِىَ اللهُ عَنْهُ قَالَ سَمِعْتُ رَسُوْلَ اللهِ صَلَّى اللہُ عَلَيْهِ وَسَلَّمَ يَقُوْلُ لِرَمَضَانَ
مَنْ قَامَهُ إِيْمَانًا وَاحْتِسَابًا غُفِرَ لَهُ مَا تَقَدَّمَ مِنْ ذَنْبِهِ
Hazrat Abu Hurairahra narrates, “I heard Allah’s Messengersa saying regarding Ramadan, ‘Whoever prays at night in it [the month of Ramadan] out of sincere faith and hoping for a reward from Allah, then all his previous sins will be forgiven.’”
(Sahih Bukhari, Kitab Salat al-Tarawih, Hadith 2008)