حَدَّثَنَا إِسْمَاعِيلُ، قَالَ: حَدَّثَنَا مَالِكٌ، عَنْ عَبْدِ اللهِ بْنِ دِينَارٍ، عَنْ عَبْدِ اللهِ بْنِ عُمَرَ، أَنَّ رَسُولَ اللهِ صلى الله عليه وسلم قَالَ: أَيُّمَا رَجُلٌ قَالَ لأَخِيهِ: كَافِرٌ، فَقَدْ بَاءَ بِهَا أَحَدُهُمَا.
Abdullah ibn 'Umar reported that the Messenger of Allah (ﷺ) said, "If a man says to his brother, 'You are an unbeliever,' it is true for one or the other of them."
Reference: Al-Adab Al-Mufrad 439 In-book : Book 24, Hadith 21 English translation : Book 24, Hadith 439
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