The Holy Prophet Muhammad, peace and blessings of Allah be upon him, said:
“Whoever established prayers on the night of Qadr out of sincere faith and hoping for a reward from Allah, then all his previous sins will be forgiven; and whoever fasts in the month of Ramadan out of sincere faith, and hoping for a reward from Allah, then all his previous sins will be forgiven.”
(Sahih al-Bukhari)
