Musnad Ahmad 25:148

Yahya ibn Sa'id narrated to us, from 'Abd al-Malik, 'Ata' narrated to us, from Ibn 'Abbas, who said: "The Messenger of Allah (peace and blessings of Allah be upon him) departed from 'Arafah, and Usamah ibn Zayd was riding behind him. The she-camel stumbled with him, and he was raising his hands, not exceeding his head. He proceeded at his steady pace until he reached Jam' (Muzdalifah). Then he departed the next day, and al-Fadl ibn 'Abbas was riding behind him. He did not cease reciting the Talbiyah until he threw the pebbles at Jamrat al-'Aqabah."