Musnad Ahmad 788:70

Abu Ahmad narrated to us, Sufyan narrated to us, from Ayyub, from Abu Qilabah, from Zahdam, from Abu Musa, that a man came while he [Abu Musa] was eating chicken, so he [the man] moved away. He said: "I have sworn not to eat it, for I saw it eating something filthy." He [Abu Musa] said: "Come near, for I have seen the Messenger of Allah, may Allah bless him and grant him peace, eating it."