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.
Reference | : Sahih Muslim 1065e |
In-book reference | : Book 12, Hadith 198 |
USC-MSA web (English) reference | : Book 5, Hadith 2327 |
(deprecated numbering scheme) |