Musnad Ahmad 360:1

Abu al-Nadr narrated to us, he said: Shayban narrated to us, from Ash'ath, he said: A sheikh from Banu Malik ibn Kinanah narrated to me, he said: I saw the Messenger of Allah, peace and blessings of Allah be upon him, at the market of Dhu al-Majaz, walking through it, saying: "O people, say 'There is no god but Allah' and you will succeed." He said: And Abu Jahl was throwing dust upon him and saying: "O people, do not let this man deceive you regarding your religion, for he only wants you to abandon your gods and abandon al-Lat and al-'Uzza." He said: And the Messenger of Allah, peace and blessings of Allah be upon him, did not turn toward him. He said: We said: "Describe the Messenger of Allah, peace and blessings of Allah be upon him, to us." He said: "Between two red garments, of medium height, having much flesh, handsome of face, intensely black of hair, white of intense whiteness, with long hair."