Sahih Muslim · Hadith 1262
The Book of Mosques and Places of Prayer - كتاب الْمَسَاجِدِ وَمَوَاضِعِ الصَّلاَةِ
حدثنا عبيد الله بن معاذ العنبري، حدثنا أبي، حدثنا كهمس، عن يزيد بن عبد الله بن الشخير، عن أبيه، قال صليت مع رسول الله صلى الله عليه وسلم فرأيته تنخع فدلكها بنعله .
Abdullah b. Shakhkhir reported on the authority of his father that he said: I said prayer with the Messenger of Allah (may peace be upon him) and saw him spitting and rubbing it off with his shoe.
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).