(13) باب النَّهْىِ عَنِ الْبُصَاقِ، فِي الْمَسْجِدِ فِي الصَّلاَةِ وَغَيْرِهَا
Anas b. Malik reported:
The Messenger of Allah (ﷺ) said: Spitting in a mosque is a sin, and its expiation is that it should be buried. (RU)
Reference (RU): Sahih Muslim 552 a (RU)
In-book reference (RU): Book 5, Hadith 69 (RU)
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1124 (RU)