Hadithcore
Riyad as-Salihin, 1732

Ibn 'Umar (May Allah be pleased with them) said:

The Messenger of Allah (ﷺ) said, "When a person calls his brother (in Islam) a disbeliever, one of them will certainly deserve the title. If the addressee is so as he has asserted, the disbelief of the man is confirmed, but if it is untrue, then it will revert to him." <b>[Al-Bukhari and Muslim]</b>.

عن ابن عمر رضي الله عنهما قال‏:‏ قال رسول الله صلى الله عليه وسلم ‏:‏ ‏

‏إذا قال رجل لأخيه‏:‏ يا كافر، فقد باء بها أحدهما، فإن كان كما قال وإلا رجعت عليه‏

‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏‏.‏

References1 variant
In-Book Reference
Book 17, Hadith 222
Sharh · explanationclick to expand
<b>Guidance from the Hadith:</b><br> 1) One should avoid describing Muslims as disbelievers or questioning their religious commitment.<br> 2) One may utter a word displeasing to Allah, and it causes him to lose both his worldly life and afterlife. So, a wise person should think twice before he speaks.
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Compare isnād across 3 related chains →