Musnad Ahmad 1013:11

Ya'qub narrated to us, my father narrated to us, from Ibn Ishaq, Abu Hazim al-Afzar, the freed slave of al-Aswad ibn Sufyan al-Makhzumi, narrated to me, from Sahl ibn Sa'd al-Sa'idi, from the Banu 'Amr, regarding a dispute, and he mentioned the hadith.