Sayyiduna Jubayr bin Mut'im (may Allah be pleased with him) said: On the Day of Arafah my camel went missing, so I went out to look for it. I saw the Messenger of Allah (peace and blessings be upon him) standing at Arafah, and I said: By Allah, he is one of the Hums; what is the matter with him?
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9452