From Sahih Muslim (Hadith 2956):
Jubair. b. Mut'im reported:I lost my camel and went in search of it on the day of 'Arafa, and I saw the Messenger of Allah (ﷺ) staying along with people in 'Ara'fit. Thereupon I said: By Allah, he is among the Hums (Quraish) ; what has happened to him that he has come to this (place)? The Quraish were counted among Hums
Reference: Muslim 2956