The Ibāḍī also approve of the first part of Ali's caliphate. Like the Shi'ites, the Ibāḍī disapprove of both Aisha's rebellion against him and Muawiya's revolt. However, the Ibāḍī regard Ali's acceptance of arbitration at the Battle of Siffin against Muawiyya's rebels as un-Islamic. The Ibāḍī consider that Al's decision made him unfit as iman, and they condemn Ali also for killing early Kharijites in an-Nahr at the Battle of Nahrawan.