question #1 Sahih al-Bukhari 35, Book 2, Hadith 28 : What is the significance of observing prayers on the night of Qadr with sincere faith?

Allah’s Messenger (ﷺ) said, “Whoever establishes the prayers on the night of
Qadr out of sincere faith and hoping to attain Allah’s rewards (not to
show off) then all his past sins will be forgiven.”