Abu Dawood: Hadith 1914

Ibn "Umar said the Apostle of Allaah (ﷺ) proceeded from Mina when he offered the dawn prayer on Yaum Al "Arafah (9th of Dhu Al Hijjah) in the morning till he came to "Arafah and he descended at Namrah. This is the place where the imam (prayer leader at "Arafah) takes his place. When the time of the noon prayer came, the Apostle of Allaah (ﷺ) proceeded earlier and combined the noon and afternoon prayers. He then addressed the people (i.e., recited the sermon) and proceeded. He stationed at a place of stationing in "Arafah.