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