It is narrated from Abu Al-Huwairith: "I saw Abu Bakr (may Allah be pleased with him) standing on the Qazah mountain, and he was saying: O people! Let the morning become clear. Then he returned, and I saw his thigh with which he was striking his camel like a stick."
Hadith Referenceمسند الإمام الشافعي / كتاب الحج / 1011