There would be two groups in my Ummah, and there would emerge another group (seceding itself from both of them), and the party nearer to the truth among the two would kill them (the group of the Khawarij). (Using translation from Muslim 1065c)
قَالَ رَسُولُ اللهِ ﷺ «سَتَكُونُ أُمَّتِي فِرْقَتَيْنِ فَتَخْرُجُ مِنْ بَيْنَهُمَا مَارِقَةٌ يَلِي قَتْلَهَا أَوْلَاهُمَا بِالْحَقِّ»