ÿAbd AllÃÂh ibn Wahb al-RÃÂsibë (; died 17 July 658 AD) was an early leader of the KhÃÂrijites. Of the Bajëla tribe, he was a , one who learned the teachings of Islam directly from a (companion) of Muḥammad. He prostrated himself in prayer so frequently that he developed calluses on his forehead, leading to the nickname, , "the man with the calluses".
ÿAbd AllÃÂh fought under á¹¢aÿd ibn Abë WaqqÃÂá¹£ in the conquest of Iraq. In the first Muslim civil war, he took the side of the Caliph ÿAlë and fought for him at the Battle of á¹¢iffën (657). He opposed ÿAlë's decision to accept arbitration to end the civil war and joined the dissidents, soon to be known as KhÃÂrijites, gathering at Ḥarà «rÃÂþ in Iraq. They later moved to Kà «fa, where they elected ÿAbd AllÃÂh as their (commander) and not, as is sometimes claimed, the true caliph (successor of Muḥammad). They marched out in March 658 and were routed by ÿAlë in the Battle of NahrawÃÂn on 17 July (9 á¹¢afar 38 AH). ÿAbd AllÃÂh was killed in battle.