Arabic (Original)
حَدَّثَنَا حَسَنُ بْنُ مُوسَى حَدَّثَنَا شَيْبَانُ عَنْ عَبْدِ الْمَلِكِ يَعْنِي ابْنَ عُمَيْرٍ عَنْ عَبْدِ الرَّحْمَنِ بْنِ عَبْدِ اللَّهِ يَعْنِي ابْنَ مَسْعُودٍ عَنْ أَبِيهِ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قِتَالُ الْمُسْلِمِ أَخَاهُ كُفْرٌ وَسِبَابُهُ فُسُوقٌ.
English Translation
Hasan ibn Musa told us: Shayban told us, from Abdul Malik — meaning ibn Umayr — from Abdul Rahman ibn Abdullah — meaning Ibn Mas'ud — from his father, who said: The Messenger of Allah (peace and blessings be upon him) said, "Fighting a Muslim is disbelief, and reviling him is corruption."