Al-Adab Al-Mufrad #441
Disparaging
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
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, may Allah
bless him and grant him peace, said, "If a man says to his brother, 'You
are an unbeliever,' it is true for one or the other of them."
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About Al-Adab Al-Mufrad
This hadith is #441 from Al-Adab Al-Mufrad, in the Book of Disparaging.