´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."
Hadith ReferenceSunan an-Nasa'i / The Book of Qiyam Al-Lail (The Night Prayer) and Voluntary Prayers During the Day / Hadith: 1603
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:متفق عليه