1489 - Abu Abd Allah narrated to us, he said: Muhammad ibn Ja'far narrated to us, he said: Shu'bah narrated to us, from Amr ibn Murrah, that he heard Abu Wa'il say: I heard Abd Allah ibn Mas'ud say: "If a man says to another man, 'You are an enemy to me,' then one of them has committed kufr (disbelief) against Islam."