Marwan bin Mua'wiya al-Fazari مروان بن معاوية الفزاري · The Book of Fasting

"Whoever fasts during Ramadan" and according to the Hadith of Qutaibah, the Prophet said: "Whoever spends the nights of Ramadan in prayer (Qiyam) out of faith and in the hope of reward, he will be forgiven his previous sins, and whoever spends the night of Lailat Al-Qadr in prayer out of faith and in the hope of reward, he will be forgiven his previous sins." '

"Hamzah asked the Messenger of Allah: 'O Messenger of Allah, should I fast while then fast and if you wish then do not fast."'