Abu Dawud
The Rites of Hajj
Book Number: 004 / Hadith Number: 1951
Narated By Rafi' ibn Amr al-Muzani : I saw the Apostle of Allah (pbuh) addressing the people at Mina (on the day of sacrifice) when the sun rose high (i.e. in the forenoon) on a white mule, and Ali (Allah be pleased with him) was interpreting on his behalf; some people were standing and some sitting.