Sa’d narrated from his father Ibrahim, who narrated from Sayyiduna Abdur Rahman bin Awf (may Allah be pleased with him), who said: Umayyah bin Khalaf said: O Abd al-Ilah! Who among you has the mark of an ostrich feather on his chest? I said: Hamzah bin Abdul Muttalib (may Allah be pleased with him). He said: He is the one who has done this to us.