Abu Huraira and Abu Sa'id narrated that the Messenger of Allah (ﷺ) saw sputum, and the rest of the hadith is the same.
Sahih Muslim Book 5, Hadith 64
← Previous Hadith The Apostle of Allah (ﷺ) saw sputum sticking to the Qibla of the mosque. He scratched it off with a pebble and then forbade spitting on the right side or in front, but (it is permissible) to spit on the left side or under the left foot.

Sahih Muslim Book 5, Hadith 63 Next Hadith → The Apostle of Allah (may, peace be upon him) saw spittle or snot or sputum, sticking to the wall towards Qibla and scratched it off.

Sahih Muslim Book 5, Hadith 65