‏الإيمان : Hadeeth No:116 It is reported on the authority of Ibn 'Umar that the Prophet (may peace and blessings be upon him) observed: When a man calls his brother an unbeliever, it returns (at least) to one of them....

‏فضائل الصحابة‏ : Hadeeth No:6110 Abu Huraira reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying in a large gathering of the Muslims: Should I not tell you of the best clans of the Ansar? They said: Allaah's Messenger, (kindly) do this. Thereupon Allaah's Messenger said: That is Banu Abd al-Ashhal. They said: Allaa...