Musnad Ahmad 658:32

Abu Ahmad narrated to us, Sufyan narrated to us, from Abu Ishaq, from al-Bara’—or someone else—who said: A man from the Ansar came with al-Abbas, whom he had taken captive. Al-Abbas said: "O Messenger of Allah, this man did not capture me. I was captured by a man from the people who was bald-headed, with such-and-such appearance." The Messenger of Allah, peace and blessings of Allah be upon him, said to the man: "Allah has aided you with a noble angel."