(37) باب كَفَّارَةِ الْبُزَاقِ فِي الْمَسْجِدِ
Narrated Anas bin Malik:
The Prophet (ﷺ) said, "Spitting in the mosque is a sin and its expiation is to bury it."
Reference: Sahih al-Bukhari 415
In-book reference: Book 8, Hadith 65
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 8, Hadith 407