Amīr al-mu’minīn on the deception of the Khārijites
Nahj al-Balāgha|Volume 1|Book 3|Chapter 323
٣٢٣. وَقَالَ (عليه السلام) وَقَدْ مَرَّ بِقَتْلَى الْخَوَارِجِ يَوْمَ النَّهْرَوَانِ: بُؤْساً لَكُمْ، لَقَدْ ضَرَّكُمْ مَنْ غَرَّكُمْ.
323. Amīr al-mu’minīn, peace be upon him, passed by the dead bodies of the Khārijites on the day of the battle of Nahrawān and said: Woe unto you! You have been harmed by him who deceived you.