(3) باب ثَوَابِ مَنْ قَامَ رَمَضَانَ إِيمَانًا وَاحْتِسَابًا
It was narrated from Abu Hurairah that:
The Messenger of Allah (ﷺ) said: "Whoever prays Qiyam during Ramadan out of faith and in the hope of reward, he will be forgiven his previous sins."
Reference: Sunan an-Nasa'i 1602
In-book reference: Book 20, Hadith 5
English translation: Vol. 2, Book 20, Hadith 1603