question #2 Sahih Muslim 760a, Book 6, Hadith 209 : How does observing prayer on Lailat-ul-Qadr impact a believer’s past sins?

He who observed the fasts of Ramadan with faith and seeking reward (from Allah), all his previous sins would be forgiven, and he who observed prayer on Lailat-ul- Qadr with faith and seeking reward (from Allah), all his previous sins would be forgiven.