question #1 Sahih al-Bukhari 406, Book 8, Hadith 58 : What is the significance of maintaining cleanliness and respect in the mosque environment?

Allah’s Messenger (ﷺ) saw sputum on the wall of the mosque in the direction of the Qibla and scraped it off.
He faced the people and said, “Whenever any one of you is praying, he should not spit in front of him
because in the prayer Allah is in front of him.”