Sunan An-Nasai, Chapter: The Book of the Times (of Prayer)

from his father that Jabir bin Abdullah said: "The Messenger of Allah (saw) traveled until he came to Arafah, where he found that the tent had been pitched for him. He stayed there until the sun had passed its zenith, then he called for Al-Qaswa' which was saddled for him. When he reached the bottom of the valley he addressed the people. Then Bilal called the Adhan, then the Iqamah, then he prayed Zuhr, then he called the Iqamah, then he prayed Asr, and he did not offer any other prayer in between." (Sahih)