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Muwatta of Imam Malik, Speech, hadith 1  http://ahadith.co.uk/permalink-hadith-4899 
Sunni Hadith 
Variant: Malik related to me from 'Abdullah ibn Dinar from 'Abdullah ibn 'Umar that the Messenger of Allah, may Allah bless him and grant him peace, said, "If a man says to his Muslim brother, 'O unbeliever!' it is true about one of them."