(22) باب فِي كَرَاهِيَةِ الْبُزَاقِ فِي الْمَسْجِدِ
Anas b. Malik reported the Prophet(ﷺ) as saying:
Spitting in the mosque is a sin and it is expiated by burying the spittle.
Reference: Sunan Abi Dawud 474
In-book reference: Book 2, Hadith 84
English translation: Book 2, Hadith 474