(10) باب كَرَاهِيَةِ النُّخَامَةِ فِي الْمَسْجِدِ
It was narrated from Anas that:
The Prophet saw some sputum in the prayer direction of the mosque and he became so angry that his face turned red. Then a woman from among the Ansar came and scraped it off, and put some Khaluq on that spot. The Messenger of Allah said: "How good this is."
Reference: Sunan Ibn Majah 762
In-book reference: Book 4, Hadith 28
English translation: Vol. 1, Book 4, Hadith 762