The Messenger of Allah said: "Fighting a Muslim is Kufr and defaming him is evildoing."
Sunan an-Nasa'i Book 37, Hadith 139
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"I used to wish that I could meet a man among the Companions of the Prophet became very angry and said: "By Allah! You will not find a man after me who is more just than me." Then he said: "A people will come at the end of time; as if he is one of them, reciting the Qur'an without it passing beyond their throats. They will go through Islam just as the arrow goes through the target. Their distinction will be shaving. They will not cease to appear until the last of them comes with Al-Masih Ad-Dajjal. So when you meet them, then kill them, they are the worst of created beings."
Sunan an-Nasa'i Book 37, Hadith 138 Next Hadith → "Defaming a Muslim is evildoing and fighting him is Kufr." (Sahih Mawquf)
Sunan an-Nasa'i Book 37, Hadith 140
Sunan an-Nasa'i Book 37, Hadith 138 Next Hadith → "Defaming a Muslim is evildoing and fighting him is Kufr." (Sahih Mawquf)
Sunan an-Nasa'i Book 37, Hadith 140