Sayyiduna Usamah bin Zayd (may Allah be pleased with him) narrates that I was riding behind the Messenger of Allah (peace be upon him) on a camel in Arafat. When he raised both his hands for supplication, his camel tilted him to one side, causing its rein to fall. The Messenger of Allah (peace be upon him) took the rein in one hand and raised the other hand for supplication.
Hadith Referenceصحيح ابن خزيمه / جماع أبواب ذكر أفعال اختلف الناس فى إباحته للمحرم، نصت سنة النبى صلى الله عليه وسلم أو دلت على إباحتها / 2824