question #1 Sahih al-Bukhari 753, Book 10, Hadith 147 : What is the significance of maintaining cleanliness and respect in the mosque during prayer?

The Prophet (ﷺ) saw expectoration in the direction of the Qibla of the mosque while he was leading the
prayer, and scratched it off. After finishing the prayer, he said, “Whenever any of you is in prayer he
should know that Allah is in front of him. So none should spit in front of him in the prayer.”