question #1 Sahih Muslim 760a, Book 6, Hadith 209 : What are the spiritual benefits of fasting during Ramadan with sincere faith and intention?

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.