The Prophet ﷺ was coming from the direction of Bir Jamal when a man met him and greeted him with salam, but the Prophet ﷺ did not return his greeting. He turned to a wall and wiped his face and hands against it, then returned the greeting.
أقبل النبي ﷺ: من نحو بئر جمل، فلقيه رجل فسلم عليه، فلم يرد عليه النبي ﷺ أقبل على الجدار فمسح بوجهه ويديه، ثم رد عليه السلام.
Bukhari (337) and Muslim in the Book of Menstruation (369) both narrated it from Layth bin Saad, from Jafar bin Rabia, from Abdul-Rahman bin Hurmuz, who said, "I heard Umayr, the freed slave of Ibn Abbas, say, 'Abdullah bin Yasar, the freed slave of Maymuna, the wife of the Prophet ﷺ, and I set out until we entered upon Abu Juhaym.'" Abu Juhaym then spoke, and he went on to relate the hadith. The wording given here is Bukhari's.In Muslim's version it appears as "Abdul-Rahman bin Yasar." Hafiz said, "This is a mistake, he has no narration in this hadith, and for this reason the compilers did not list him among the narrators of the Sahihayn." End of quote.This hadith also appears in Sahih Muslim in suspended form, for Muslim said, "Layth bin Saad narrated," even though he never met him. Bukhari, however, connected the chain, narrating from Yahya bin Bukayr (that is, Yahya bin Abdullah bin Bukayr al-Makhzumi al-Misri), who said, "Layth bin Saad narrated to us," and then gave the chain of transmission.Yahya bin Bukayr meets Muslim's criteria, for Muslim relied on his narrations as evidence.Among the useful points, Maziri said in Al-Mulim (1/256), "Muslim mentioned this hadith in disconnected form, and in his book there are a small number of disconnected hadiths occurring in fourteen places, among them this very hadith we have mentioned, which is the first of them."Rashid al-Din Yahya bin Ali al-Attar, who died in 662 AH, wrote a treatise titled Ghurar al-Fawaid al-Majmua fi Bayan ma Waqaa fi Sahih Muslim min al-Ahadith al-Maqtua, which was edited by professor Mashhur Hasan Salman.