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.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:18679a –
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السيوطي:١٨٦٧٩a –

"مَا أكفَرَ رَجُلٌ رَجُلًا قَطُّ إِلَّا بَاءَ بِهَا أحَدُهُمَا".  

[حب] ابن حبّان عن أبي سعيد

See similar narrations below:

Collected by Ibn Ḥibbān
ibnhibban:248 – al-Ḥasan b. Sufyān > al-Ḥasan b. ʿUmar b. Shaqīq > Salamah b. al-Faḍl > Ibn Isḥāq > ʿĀṣim b. ʿUmar b. Qatādah > Maḥmūd b. Labīd > Abū Saʿīd

[Machine] The Messenger of Allah ﷺ said, "No person accuses another of disbelief except that one of them will carry the burden of it, either the accuser if the accused is a disbeliever, or the accused if he falsely accuses the other."  

ابن حبّان:٢٤٨ – أَخْبَرَنَا الْحَسَنُ بْنُ سُفْيَانَ حَدَّثَنَا الْحَسَنُ بْنُ عُمَرَ بْنِ شَقِيقٍ حَدَّثَنَا سَلَمَةُ بْنُ الْفَضْلِ عَنِ ابْنِ إِسْحَاقَ عَنْ عَاصِمِ بْنِ عُمَرَ بْنِ قَتَادَةَ عَنْ مَحْمُودِ بْنِ لَبِيدٍ عَنْ أَبِي سَعِيدٍ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ «مَا أَكْفَرَ رَجُلٌ رَجُلًا قَطُّ إِلَّا بَاءَ أَحَدُهُمَا بِهَا إِنْ كَانَ كَافِرًا وَإِلَّا كَفَرَ بِتَكْفِيرِهِ»