The Book of Zakat
12/49. Chapter:
The Khawarij are the most evil of people and of all creation
Sahih Muslim
وَحَدَّثَنَاهُ أَبُو كَامِلٍ، حَدَّثَنَا عَبْدُ الْوَاحِدِ، حَدَّثَنَا سُلَيْمَانُ الشَّيْبَانِيُّ، بِهَذَا الإِسْنَادِ وَقَالَ يَخْرُجُ مِنْهُ أَقْوَامٌ .
This hadith had been transmitted by Sulaiman Shaibani with the same chain of narrators (and the words are)," There would arise out of (this group) many a group"
Reference : Sahih Muslim 1068bIn-book reference : Book 12, Hadith 208USC-MSA web (English) reference : Book 5, Hadith 2337