It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) was supplicating at Arafah with his hands raised when the she-camel's rein fell from his (peace and blessings be upon him) hand. He (peace and blessings be upon him) took hold of it, then raised his hands again and continued supplicating. The Companions of the Messenger of Allah (peace and blessings be upon him) (may Allah be pleased with them) said: "This is ibtihal (humble entreaty) and tadarru' (imploring)."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from al-A'mash except al-Fadl bin Musa."
Hadith Referenceالمعجم الأوسط / باب الميم / 5141
Hadith Takhrij«أخرجه البزار فى «مسنده» برقم: 7558، والطبراني فى «الأوسط» برقم: 5706»