Musnad Ahmad 27:286

Ibn Numayr narrated to us, Yahya narrated to us, from Abdullah ibn Abi Salamah, from Abdullah ibn Abdullah ibn Umar, from his father, who said: "We set out early with the Messenger of Allah, may Allah bless him and grant him peace, from Mina to Arafat. Among us were those who were reciting the Talbiyah, and among us were those who were reciting the Takbir."