(39) باب ثَوَابِ مَنْ قَامَ رَمَضَانَ وَصَامَهُ إِيمَانًا وَاحْتِسَابًا وَالاِخْتِلاَفِ عَلَى الزُّهْرِيِّ فِي الْخَبَرِ فِي ذَلِكَ
It was narrated that Abu Hurairah said:
"The Messenger of Allah said: 'Whoever fasts Ramadan out of faith and in the hope of reward, he will be forgiven his previous sins."'
Reference: Sunan an-Nasa'i 2204
In-book reference: Book 22, Hadith 115
English translation: Vol. 3, Book 22, Hadith 2206