Amīr al-mu’minīn on the deception of the Khārijites
Nahj al-Balāgha|Volume 1|Book 3|Chapter 323
فَقِيلَ لَهُ: مَنْ غَرَّهُمْ يَا أَمِيرَ الْمُؤْمِنِينَ؟ فَقَالَ: الشَّيْطَانُ الْمُضِلُّ، وَالْأَنْفُسُ الْأَمَّارَةُ بِالسُّوءِ، غَرَّتْهُمْ بِالْأَمَانِيِّ، وَفَسَحَتْ لَهُمْ فِي المَعَاصِيِ، وَوَعَدَتْهُمُ الْإِظْهَارَ، فَاقْتَحَمَتْ بِهِمُ النَّارَ.
He was asked: O’ Amīr al-mu’minīn, who deceived them? Then, he replied: Satan, the deceiver, and the inner spirit that leads one to evil deceived them through passions, made it easy for them to get into sins, promised them victory and eventually threw them into the Fire.