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.
suyuti:19620a
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السيوطي:١٩٦٢٠a

"مَا مِنْ مُسْلِمين إِلا بَينَهُمَا سِتْرٌ، فَإِذا قَال أَحَدُهُمَا لِصاحِبِهِ: هُجْرًا، هَتَك بِسِتْرِ الله، وَإِذا قال: يَا كافِرُ، فَقدْ كَفر أَحدُهُمَا".  

الحكيم، [طب] الطبرانى في الكبير [هب] البيهقى في شعب الإيمان عن ابن مسعود

See similar narrations below:

Collected by Ṭabarānī
tabarani:10544Muḥammad b. ʿAbdullāh al-Ḥaḍramī > Ṭāhir b. Abū Aḥmad al-Zubayrī > Abū Bakr b. ʿAyyāsh > Yazīd b. ʿAbdullāh > ʿAmr b. Salamah > ʿAbdullāh b. Masʿūd

[Machine] The Messenger of Allah ﷺ said: "There is no two Muslims except that there is a barrier between them from Allah. So if one of them says to his companion 'Hujr' (meaning boycott or severance), he has violated the barrier. And if one of them says 'O disbeliever', then he has committed disbelief."  

الطبراني:١٠٥٤٤حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللهِ الْحَضْرَمِيُّ ثنا طَاهِرُ بْنُ أَبِي أَحْمَدَ الزُّبَيْرِيُّ ثنا أَبُو بَكْرِ بْنُ عَيَّاشٍ حَدَّثَنِي يَزِيدُ بْنُ عَبْدِ اللهِ قَالَ سَمِعْتُ عَمْرَوَ بْنَ سَلَمَةَ عَنْ عَبْدِ اللهِ بْنِ مَسْعُودٍ قَالَ

قَالَ رَسُولُ اللهِ ﷺ مَا مِنْ مُسْلِمَيْنِ إِلَّا وَبَيْنَهُمَا سِتْرٌ مِنَ اللهِ فَإِذَا قَالَ أَحَدُهُمَا لِصَاحِبِهِ هُجْرًا هَتَكَ سِتْرَهُ وَإِذَا قَالَ يَا كَافِرُ فَقَدْ كَفَرَ أَحَدُهُمَا