"A group will secede at a time of division among the people, and they will be killed by the group that is closer to the truth."
Sahih Muslim Book 12, Hadith 197
← Previous Hadith 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).

Sahih Muslim Book 12, Hadith 196 Next Hadith → Abu Sa'id al-Khudri reported from the Messenger of Allah (ﷺ) that a group (Khawarij) would emerge from the different parties (the party of Hadrat 'Ali and the party of Amir Mu'awiya), the group nearer the truth between the two would kill them.

Sahih Muslim Book 12, Hadith 198