Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.

You would risk becoming a disbeliever if you call another Muslim a kāfir (disbeliever)

bukhari:6104Ismāʿīl > Mālik > ʿAbdullāh b. Dīnār > ʿAbdullāh b. ʿUmar

The Messenger of Allah ﷺ said, "If anyone says to his brother O kāfir (disbeliever)! Then surely, one of them such."  

البخاري:٦١٠٤حَدَّثَنَا إِسْمَاعِيلُ قَالَ حَدَّثَنِي مَالِكٌ عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ ؓ

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ: «أَيُّمَا رَجُلٍ قَالَ لأَخِيهِ: يَا كَافِرُ، فَقَدْ بَاءَ بِهَا أَحَدُهُمَا۔»  


See similar narrations below:

Collected by Muslim, Tirmidhī, Mālik, Aḥmad, Ibn Ḥibbān, Suyūṭī
muslim:60aAbū Bakr b. Abū Shaybah > Muḥammad b. Bishr And ʿAbd Allāh b. Numayr > ʿUbaydullāh b. ʿUmar > Nāfiʿ > Ibn ʿUmar

When a man calls his brother an unbeliever, it returns (at least) to one of them.  

مسلم:٦٠aحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ حَدَّثَنَا مُحَمَّدُ بْنُ بِشْرٍ وَعَبْدُ اللَّهِ بْنُ نُمَيْرٍ قَالاَ حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ عُمَرَ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ

أَنَّ النَّبِيَّ ﷺ قَالَ إِذَا كَفَّرَ الرَّجُلُ أَخَاهُ فَقَدْ بَاءَ بِهَا أَحَدُهُمَا  

muslim:60bYaḥyá b. Yaḥyá al-Tamīmī And Yaḥyá b. Ayyūb Waqutaybah b. Saʿīd Waʿalī b. Ḥujr > Ismāʿīl b. Jaʿfar > Yaḥyá b. Yaḥyá > Ismāʿīl b. Jaʿfar > ʿAbdullāh b. Dīnār > Ibn ʿUmar

Any person who called his brother: "O unbeliever" (has in fact done an act by which this unbelief) would return to one of them. If it were so, as he asserted (then the unbelief of man was confirmed but if it was not true), then it returned to him (to the man who labeled it on his brother Muslim).  

مسلم:٦٠bوَحَدَّثَنَا يَحْيَى بْنُ يَحْيَى التَّمِيمِيُّ وَيَحْيَى بْنُ أَيُّوبَ وَقُتَيْبَةُ بْنُ سَعِيدٍ وَعَلِيُّ بْنُ حُجْرٍ جَمِيعًا عَنْ إِسْمَاعِيلَ بْنِ جَعْفَرٍ قَالَ يَحْيَى بْنُ يَحْيَى أَخْبَرَنَا إِسْمَاعِيلُ بْنُ جَعْفَرٍ عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ أَنَّهُ سَمِعَ ابْنَ عُمَرَ يَقُولُ

قَالَ رَسُولُ اللَّهِ ﷺ أَيُّمَا امْرِئٍ قَالَ لأَخِيهِ يَا كَافِرُ فَقَدْ بَاءَ بِهَا أَحَدُهُمَا إِنْ كَانَ كَمَا قَالَ وَإِلاَّ رَجَعَتْ عَلَيْهِ  

tirmidhi:2637Qutaybah > Mālik b. Anas > ʿAbdullāh b. Dīnār > Ibn ʿUmar

Ibn 'Umar narrated that the Prophet ﷺ said: "Whoever says to his brother 'disbeliever' then it will have settled upon one of them." Sahih  

الترمذي:٢٦٣٧حَدَّثَنَا قُتَيْبَةُ عَنْ مَالِكِ بْنِ أَنَسٍ عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ عَنِ ابْنِ عُمَرَ

عَنِ النَّبِيِّ ﷺ قَالَ أَيُّمَا رَجُلٍ قَالَ لأَخِيهِ كَافِرٌ فَقَدْ بَاءَ بِهِ أَحَدُهُمَا هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ غَرِيبٌ وَمَعْنَى قَوْلِهِ بَاءَ يَعْنِي أَقَرَّ  

malik:56-1Mālik > ʿAbdullāh b. Dīnār > ʿAbdullāh b. ʿUmar

Malik related to me from Abdullah ibn Dinar from Abdullah ibn Umar that the Messenger of Allah ﷺ said, "If a man says to his muslim brother, 'O kafir!' it is true about one of them."  

مالك:٥٦-١حَدَّثَنِي مَالِكٌ عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ مَنْ قَالَ لأَخِيهِ يَا كَافِرُ فَقَدْ بَاءَ بِهَا أَحَدُهُمَا  

ahmad:6280Ibn Numayr And Ḥammād b. Usāmah > ʿUbaydullāh > Nāfiʿʿan Ibn ʿUmar

[Machine] "From the Prophetﷺ who said: Whoever disbelieves in his brother, one of them will bear the consequences."  

أحمد:٦٢٨٠حَدَّثَنَا ابْنُ نُمَيْرٍ وَحَمَّادُ بْنُ أُسَامَةَ قَالَا حَدَّثَنَا عُبَيْدُ اللهِ عَنْ نَافِعٍعَنِ ابْنِ عُمَرَ

عَنِ النَّبِيِّ ﷺ قَالَ مَنْ كَفَّرَ أَخَاهُ فَقَدْ بَاءَ بِهَا أَحَدُهُمَا  

ahmad:5914Muʾammal > Sufyān > ʿAbdullāh b. Dīnār > Ibn ʿUmar

[Machine] The Messenger of Allah ﷺ said: "Whoever says to his brother, 'O disbeliever,' one of them has indeed earned it."  

أحمد:٥٩١٤حَدَّثَنَا مُؤَمَّلٌ حَدَّثَنَا سُفْيَانُ حَدَّثَنَا عَبْدُ اللهِ بْنُ دِينَارٍ سَمِعْتُ ابْنَ عُمَرَ يَقُولُ

قَالَ رَسُولُ اللهِ ﷺ مَنْ قَالَ لِأَخِيهِ يَا كَافِرُ فَقَدْ بَاءَ بِهَا أَحَدُهُمَا  

ahmad:5933Isḥāq > Mālik > ʿAbdullāh b. Dīnār > Ibn ʿUmar

Messenger of Allah ﷺ said, 'If anyone says to his brother, 'O misbeliever! Then surely, one of them such." (Using translation from Bukhārī 6104)  

أحمد:٥٩٣٣حَدَّثَنَا إِسْحَاقُ أَخْبَرَنَا مَالِكٌ عَنْ عَبْدِ اللهِ بْنِ دِينَارٍ عَنِ ابْنِ عُمَرَ قَالَ

قَالَ رَسُولُ اللهِ ﷺ أَيُّمَا رَجُلٍ قَالَ لِأَخِيهِ يَا كَافِرُ فَقَدْ بَاءَ بِهَا أَحَدُهُمَا  

ahmad:5077And Jadt Fī Kitāb Abū > Ḥajjāj > Shuʿbah > ʿAbdullāh b. Dīnār > Ibn ʿUmar

[Machine] On the authority of the Prophet ﷺ , he said: When a man says to his brother, "You are a disbeliever" or "O disbeliever," then one of them has brought it upon himself.  

أحمد:٥٠٧٧قَالَ وَجَدْتُ فِي كِتَابِ أَبِي حَدَّثَنَا حَجَّاجٌ أَخْبَرَنَا شُعْبَةُ عَنْ عَبْدِ اللهِ بْنِ دِينَارٍ عَنِ ابْنِ عُمَرَ

عَنِ النَّبِيِّ ﷺ أَنَّهُ قَالَ إِذَا قَالَ الرَّجُلُ لِأَخِيهِ أَنْتَ كَافِرٌ أَوْ يَا كَافِرُ فَقَدْ بَاءَ بِهَا أَحَدُهُمَا  

ahmad:4687Yaḥyá > Sufyān > Ibn Dīnār > Ibn ʿUmar

[Machine] The Prophet ﷺ said, "If any of you says to his brother, 'O disbeliever,' then it will surely apply to one of them."  

أحمد:٤٦٨٧حَدَّثَنَا يَحْيَى عَنْ سُفْيَانَ حَدَّثَنِي ابْنُ دِينَارٍ سَمِعْتُ ابْنَ عُمَرَ

عَنِ النَّبِيِّ ﷺ قَالَ إِذَا أَحَدُكُمْ قَالَ لِأَخِيهِ يَا كَافِرُ فَقَدْ بَاءَ بِهَا أَحَدُهُمَا  

ahmad:5259Wakīʿ > Sufyān > ʿAbdullāh b. Dīnār > Ibn ʿUmar

[Machine] The Messenger of Allah ﷺ said, "Whoever says to his brother 'O disbeliever,' then surely one of them has earned it."  

أحمد:٥٢٥٩حَدَّثَنَا وَكِيعٌ عَنْ سُفْيَانَ عَنْ عَبْدِ اللهِ بْنِ دِينَارٍ عَنِ ابْنِ عُمَرَ قَالَ

قَالَ رَسُولُ اللهِ ﷺ أَيُّمَا امْرِئٍ قَالَ لِأَخِيهِ يَا كَافِرُ فَقَدْ بَاءَ بِهَا أَحَدُهُمَا  

ibnhibban:249al-Ḥusayn b. Idrīs al-Anṣārī > Aḥmad b. Abū Bakr > Mālik > ʿAbdullāh b. Dīnār > Ibn ʿUmar

Messenger of Allah ﷺ said, 'If anyone says to his brother, 'O misbeliever! Then surely, one of them such." (Using translation from Bukhārī 6104)  

ابن حبّان:٢٤٩أَخْبَرَنَا الْحُسَيْنُ بْنُ إِدْرِيسَ الْأَنْصَارِيُّ قَالَ حَدَّثَنَا أَحْمَدُ بْنُ أَبِي بَكْرٍ عَنْ مَالِكٍ عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ عَنِ ابْنِ عُمَرَ

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ «أَيُّمَا رَجُلٌ قَالَ لِأَخِيهِ كَافِرٌ فَقَدْ بَاءَ بِهِ أَحَدُهُمَا»  

ذِكْرُ وَصْفِ قَوْلِهِ ﷺ «فَقَدْ بَاءَ بِهِ أَحَدُهُمَا»

ibnhibban:250Muḥammad b. ʿAbd al-Raḥman al-Sāmī > Yaḥyá b. Ayyūb al-Maqābirī > Ismāʿīl b. Jaʿfar > ʿAbdullāh b. Dīnār > Ibn ʿUmar

Any person who called his brother: "O unbeliever" (has in fact done an act by which this unbelief) would return to one of them. If it were so, as he asserted (then the unbelief of man was confirmed but if it was not true), then it returned to him (to the man who labeled it on his brother Muslim). (Using translation from Muslim 60b)  

ابن حبّان:٢٥٠أَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ الرَّحْمَنِ السَّامِيُّ قَالَ حَدَّثَنَا يَحْيَى بْنُ أَيُّوبَ الْمَقَابِرِيُّ قَالَ حَدَّثَنَا إِسْمَاعِيلُ بْنُ جَعْفَرٍ قَالَ أَخْبَرَنِي عَبْدُ اللَّهِ بْنُ دِينَارٍ أَنَّهُ سَمِعَ ابْنَ عُمَرَ يَقُولُ

قَالَ رَسُولُ اللَّهِ ﷺ «أَيُّمَا امْرِئٍ قَالَ لِأَخِيهِ كَافِرٌ فَقَدْ بَاءَ بِهِ أَحَدُهُمَا إِنْ كَانَ كَمَا قَالَ وَإِلَّا رَجَعَتْ عَلَيْهِ»  

suyuti:1355a

When a man calls his brother an unbeliever, it returns (at least) to one of them. (Using translation from Muslim 60a)   

السيوطي:١٣٥٥a

"إذا أكْفَرَ الرَّجُلُ أخاهُ فَقَدْ باءَ بِها أَحَدُهما" .  

[م] مسلم عن ابن عمر
suyuti:9444a
Request/Fix translation

  

السيوطي:٩٤٤٤a

"أيُّمَا امْرِئ قَال لأخيه "كَافِرٌ" فَقَدْ بَاءَ بها أحَدُهُمَا إِنْ كَانَ كمَا قَال، وَإلا رَجَعتْ عَلَيهِ ".  

[م] مسلم [ت] الترمذي عن ابن عمرَ، ابن قانع عن سويد بن مُقَرن