Sahih al-Bukhari 6104

Whoever calls his brother a Kafir without any grounds

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حَدَّثَنَا 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۔»

Translation

Chain of narrators

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

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Muhammad Fuad Abd al-Baqi	Agreed Upon	hadithunlocked

ʿAbdullāh b. ʿUmar b. al-Khaṭṭāb
One of the Companions who narrated most often, and one of the ʿAbādilah; he was among the people most strict in following the narrations (athar).d. 72 AH, or 73 AH, or 74 AH, also said: 75 AH
عَبْدُ اللهِ بْنُ عُمَرَ بْنِ الْخَطَّابِأحد المكثرين من الصحابة والعبادلة ، وكان من أشد الناس اتباعا للأثر
عن
ʿAbdullāh b. Dīnār
trustworthy (thiqah)d. 127 AH, or 131 AH, or 136 AH, also said: 132 AH
عَبْدِ اللهِ بْنِ دِينَارٍثقة
عن
Mālik b. Anas
The jurist (al-faqīh), the Imam of the Abode of Migration (Imām Dār al-Hijrah), the head of the proficient masters, and the foremost among the meticulous.d. 178 AH, or 179 AH
مَالِكٌالفقيه ، إمام دار الهجرة ، رأس المتقنين ، وكبير المتثبتين
حدثني
Ismāʿīl b. Abī Uways
Truthful (ṣadūq); he made mistakes in some hadiths from his memoryd. 226 AH, also said: 227 AH
إِسْمَاعِيلُصدوق ، أخطأ في أحاديث من حفظه
حدثنا
al-Bukhārī
a mountain of memorization and the leader of the world in the comprehension of hadith (jabal al-ḥifẓ wa-imām al-dunyā fī fiqh al-ḥadīth)d. 256 AH
الْبُخَارِيُّجبل الحفظ وإمام الدنيا في فقه الحديث

Who each narrator was and how reliable, from hdith.com

Latin names and English verdicts with a dotted underline are machine translations, not reviewed.

Sharḥ Riyad al-Salihin (Ibn al-ʿUthaymin)

Mirqāt al-Mafātīḥ (al-Mullā ʿAlī Qārī)

Lamaʿāt al-Tanqīḥ (ʿAbd al-Ḥaqq al-Dihlawī)

Fatḥ al-Bārī (Ibn Ḥajar)