1436 - Abu 'Abd Allah narrated to us, he said: Yahya ibn Sa'id narrated to us, from Habib ibn al-Shahid, he said: al-Hasan narrated to us, from Abu al-Ahwas, from 'Abd Allah, who said: "Reviling a believer is an act of defiance (fisq), and fighting him is an act of disbelief (kufr)."