Authentic hadithNarrated by Bukhari & Muslim
Any person who says to his brother: O disbeliever, it will, indeed, fall upon one of them; if he is as he said, or else it will return to him
عن ابْنِ عُمَرَ رَضيَ اللهُ عنهُما قَالَ: قَالَ رَسُولُ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ: «أَيُّمَا امْرِئٍ قَالَ لِأَخِيهِ: يَا كَافِرُ، فَقَدْ بَاءَ بِهَا أَحَدُهُمَا، إِنْ كَانَ كَمَا قَالَ، وَإِلَّا رَجَعَتْ عَلَيْهِ».
Explanation
The Prophet (may Allah's peace and blessings be upon him) warned against a Muslim saying to his Muslim brother: O disbeliever. By saying that word of disbelief, one of them deserves it; if he is as he said, then it applies to the person being addressed, or else the charge of disbelief returns to the sayer.
Source
صحيح البخاري (8/ 26) (6104).
صحيح مسلم (1/ 79) (60).
البحر المحيط الثجاج في شرح صحيح الإمام مسلم بن الحجاج (2/ 390).
إرشاد الساري لشرح صحيح البخاري (9/ 65).
النهاية في غريب الحديث والأثر (91).
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