Ibn Umar reported that the Messenger of Allah (ﷺ) saw sputum sticking to the Qibla wall of the mosque, the rest of the hadith is the same.
Sahih Muslim Book 5, Hadith 62
← Previous Hadith The Messenger of Allah (ﷺ) saw spittle on the wall towards Qibla, and scratched it away and then turning to the people said: When any one of you prays, he must not spit in front of him, for Allah is in front of him when he is engaged in prayer.

Sahih Muslim Book 5, Hadith 61 Next 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