Jami' at-Tirmidhi
Jami` at-Tirmidhi 2634
حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ بَزِيعٍ، حَدَّثَنَا عَبْدُ الْحَكِيمِ بْنُ مَنْصُورٍ الْوَاسِطِيُّ، عَنْ عَبْدِ الْمَلِكِ بْنِ عُمَيْرٍ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ عَبْدِ اللَّهِ بْنِ مَسْعُودٍ، عَنْ أَبِيهِ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " قِتَالُ الْمُسْلِمِ أَخَاهُ كُفْرٌ وَسِبَابُهُ فُسُوقٌ " . وَفِي الْبَابِ عَنْ سَعْدٍ وَعَبْدِ اللَّهِ بْنِ مُغَفَّلٍ . قَالَ أَبُو عِيسَى حَدِيثُ ابْنِ مَسْعُودٍ حَدِيثٌ حَسَنٌ صَحِيحٌ . وَقَدْ رُوِيَ عَنْ عَبْدِ اللَّهِ بْنِ مَسْعُودٍ مِنْ غَيْرِ وَجْهٍ .
Unreviewed translation. All hadiths in this collection are available in five languages. Titles and introductions may remain in Arabic.
‘Abdullah ibn Mas‘ud reported that the Messenger of Allah said: ‘A Muslim’s fighting his brother is disbelief, and insulting him is sinful disobedience.’ Abu ‘Isa said: ‘The hadith of Ibn Mas‘ud is hasan sahih, and it has been narrated from him through more than one route.’ Reports on this topic are also related from Sa‘d and ‘Abdullah ibn Mughaffal.
Notes and open questions — unreviewed
The source uses kufr for fighting and fisq for verbal abuse; both terms are translated directly without adding a doctrinal qualification absent from this entry.