Do not fight the Kharijites after me, because one who seeks right but does not find it, is not like one who seeks wrong and finds it.
As-Sayyid ar-Radi says: (By "one who seeks wrong and finds it") Amir al-mu'minin means Mu'awiyah and his men.
وقال (عليه السلام) فيهم لاَ تَقْتُلُوا الْخَوَارِجَ بَعْدِي، فَلَيْسَ مَنْ طَلَبَ الْحَقَّ فَأَخْطَأَهُ، كَمَنْ طَلَبَ الْبَاطِلَ فَأَدْرَكَهُ. قال السيد الشريف: يعني معاوية وأصحابه.
(1) Al-Saduq, 'Ilal, 201; (2) al-Tusi, al-Tahdhib, II, 48.
When Amir al-mu'minin was told that the Kharijites had been totally killed, he said
When Amir al-mu'minin was warned of being killed by deceit, he said