Abdullah said, "There is a veil from Allah Almighty between every two Muslims. When one of them says ugly words to his companion, he has rent the veil of Allah. When one of them tells the other, 'You are an unbeliever,' then one of them has disbelieved."
Reference: Al-Adab Al-Mufrad 435 In-book : Book 24, Hadith 17 English translation : Book 24, Hadith 435
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