1476 - He [Abu Abd Allah] said: Abu Abd Allah narrated to us, saying: Mu'awiyah ibn 'Amr narrated to us, saying: Abu Ishaq narrated to us, from al-A'mash, from 'Umarah ibn 'Umayr, from 'Abd al-Rahman ibn Yazid, who said: I heard 'Abdullah say: "If a man says to his brother, 'You are my enemy,' then one of the two has committed an act of disbelief (kufr)."