(22) باب فِي كَرَاهِيَةِ الْبُزَاقِ فِي الْمَسْجِدِ
Anas b. Malik reported:
The Messenger of Allah(ﷺ) said: Spitting phlegm in the mosque... The narrator then transmitted the rest of the tradition to the same effect.
Reference: Sunan Abi Dawud 476
In-book reference: Book 2, Hadith 86
English translation: Book 2, Hadith 476