(30) باب الْبُصَاقِ فِي الْمَسْجِدِ
It was narrated that Anas said:
"The Messenger of Allah (ﷺ) said: 'Spitting in the Masjid is a sin, and its expiation is to bury it.'" (ID)
Reference (ID): Sunan an-Nasa'i 723 (ID)
In-book reference (ID): Book 8, Hadith 36 (ID)
English translation (ID): Vol. 1, Book 8, Hadith 724 (ID)