Sayyiduna al-Bara' (may Allah be pleased with him) and others narrate: A man from the Ansar came bringing Sayyiduna al-Abbas (may Allah be pleased with him), whom he had taken captive. Sayyiduna al-Abbas (may Allah be pleased with him) said: "O Messenger of Allah, he did not take me captive; someone else took me captive. I was apart, and the appearance of the one who captured me was such-and-such." The Prophet (peace and blessings be upon him) said to that man: "Allah Almighty has helped you through a noble angel."
Ahmad recorded it, and its narrators are the narrators of the Sahih.