Mishkat al-Masabih #3393
Retaliation
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «يَكُونُ أُمَّتِي فِرْقَتَيْنِ فَيَخْرُجُ مِنْ بَيْنِهِمَا مَارِقَةٌ يَلِي قَتْلَهُمْ أولاهم بِالْحَقِّ» . رَوَاهُ مُسلم
Abu Sa'id al-Khudri reported God’s Messenger as saying, “My people will be in two sections from among whom a seceding party will go out, and those who are nearest to the truth will undertake the killing of them.”
Muslim transmitted it.
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About Mishkat al-Masabih
This hadith is #3393 from Mishkat al-Masabih, in the Book of Retaliation.