(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. (JA)
Reference (JA): Sahih Muslim 552 a (JA)
In-book reference (JA): Book 5, Hadith 69 (JA)
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1124 (JA)