Kammala jumla mai zuwa: ʿAbd Allāh ya yi yaƙi a ƙarƙashin Ṣaʿd ibn Abī Waḳḳāṣ a cikin cin nasarar Iraki. A cikin
a cikin yakin basasa na musulmi na farko, ya ɗauki bangaren Khalifa ʿAlī kuma ya yi yaƙi a madadinsa a yakin Ṣiffīn (657). Ya yi adawa da shawarar ʿAlī na karɓar sulhu don kawo ƙarshen yakin basasa kuma ya shiga cikin masu adawa, ba da daɗewa ba za a san su da Khārijites, suna taruwa a Ḥarūrāʾ a Iraki. Daga baya suka koma Kūfa, inda suka zaɓi ʿAbd Allāh a matsayin "amīr" (shugaba) kuma ba, kamar yadda ake da'awa a wasu lokuta, hakikanin halifa (mai maye gurbin Muḥammad). Sun yi tafiya a watan Maris na 658 kuma ʿAlī ya fatattake su a yakin Nahrawān a ranar 17 ga Yuli (9 Ṣafar 38 AH). ʿAbd Allāh ya mutu a yaƙi.