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:2264a –
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السيوطي:٢٢٦٤a –

"إذَا قال الرَّجلُ لأخيه: أنْتَ لي عدوٌّ فقدْ باءَ أحدُهما بإِثمِه إنْ كان كذلكَ، وإلا رجعتْ على الأوّل".  

الخرائطى في مساوئ الأخلاق عن ابن عمر

See similar narrations below:

Collected by Aḥmad
ahmad:5035 – Muḥammad b. Jaʿfar > Shuʿbah > ʿAbdullāh b. Dīnār > Ibn ʿUmar

[Machine] From the Prophet ﷺ that he said, "When a man says to another man, 'O disbeliever,' then one of them will bear the consequences of what he said, if it is as he described. Otherwise, it will return upon the other."  

أحمد:٥٠٣٥ – حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ حَدَّثَنَا شُعْبَةُ عَنْ عَبْدِ اللهِ بْنِ دِينَارٍ سَمِعْتُ ابْنَ عُمَرَ يُحَدِّثُ

عَنِ النَّبِيِّ ﷺ أَنَّهُ قَالَ إِذَا قَالَ الرَّجُلُ لِلرَّجُلِ يَا كَافِرُ فَقَدْ بَاءَ بِهِ أَحَدُهُمَا إِنْ كَانَ كَمَا قَالَ وَإِلَّا رَجَعَتْ عَلَى الْآخَرِ