The Messenger of Allah saw some sputum on the wall of the mosque. He picked up a stone and scraped it off, then he said, "If anyone of you needs to spit, he should not spit in fro not of him or to his right; let him spit to his right; let him spit to his left or under his left foot."
Sunan Ibn Majah Book 4, Hadith 27
← Previous Hadith "The first person who put lamps in the mosque was Tamim Ad-Dari."

Sunan Ibn Majah Book 4, Hadith 26 Next Hadith → 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."

Sunan Ibn Majah Book 4, Hadith 28