question #1 Sahih al-Bukhari 749, Book 10, Hadith 143 : What significance does the Qibla hold in Islamic prayer and its relation to the mosque?

The Prophet (ﷺ) led us in prayer and then went up to the pulpit and beckoned with both hands towards the
Qibla of the mosque and then said, “When I started leading you in prayer, I saw the display of
Paradise and Hell on the wall of the mosque (facing the Qibla). I never saw good and bad as I have
seen today.” He repeated the last statement thrice.