Zayd bin Wahb reported,

Zayd bin Wahb reported that he was among the army that marched with Ali against the Khawarij. Ali said, "People, I heard the Messenger of Allah ﷺ say, 'A people will emerge from my nation who recite the Quran. Your recitation compared to theirs will seem like nothing, your prayer compared to theirs will seem like nothing, and your fasting compared to theirs will seem like nothing. They recite the Quran thinking it is in their favor, but it is against them. Their prayer does not pass beyond their collarbones. They pass through Islam as an arrow passes through its prey. If the army that strikes them down knew what their Prophet ﷺ has decreed for them, they would rely on this deed alone and abandon other works. The sign of this is that among them is a man with an upper arm but no forearm. At the tip of his upper arm is something like a nipple, with white hairs on it. Will you go off to Muawiya and the people of Sham and leave these people behind to take your place among your women and property? By Allah, I truly hope these are the very people, for they have shed forbidden blood and raided people's grazing herds. March in the name of Allah.'"Salama bin Kuhayl said, Zayd bin Wahb described to me each stop along the way until he said, "We crossed a bridge, and when we met them, the leader of the Khawarij that day was Abdullah bin Wahb al-Rasibi. He said to them, 'Throw down your spears and draw your swords from their sheaths, for I fear they will appeal to you as they appealed to you on the day of Harura, and you will turn back.' So they cast aside their spears, drew their swords, and the people pierced them with their spears. They were killed, falling one on top of another, and on that day only two men from our side were struck down."Ali said, "Search among them for the maimed man." They searched but did not find him. Ali himself rose and came to a place where bodies lay piled upon one another. He said, "Move them aside." They found him among those nearest the ground. Ali exclaimed, "Allahu Akbar," then said, "Allah has spoken the truth and His Messenger has delivered the message."Ubayda al-Salmani stood up and said, "Commander of the Believers, by Allah besides whom there is no god, did you yourself hear this hadith from the Messenger of Allah ﷺ?"Ali replied, "Yes, by Allah besides whom there is no god."He kept asking him to swear, three times in all, and Ali kept swearing to him.

عن زيد بن وهب الجهني

أنه كان في الجيش الذين كانوا مع علي رضي الله عنه الذين ساروا إلى الخوارج، فقال علي رضي الله عنه: أيها الناس إني سمعت رسول الله ﷺ يقول: يخرج قوم من أمتي يقرؤون القرآن، ليس قراءتكم إلى قراءتهم بشيء، ولا صلاتكم إلى صلاتهم بشيء، ولا صيامكم إلى صيامهم بشيء، يقرؤون القرآن يحسبون أنه لهم وهو عليهم لا تجاوز صلاتهم تراقيهم، يمرقون من الإسلام كما يمرق السهم من الرمية. لو يعلم الجيش الذين يصيبونهم ما قضي لهم على لسان نبيهم ﷺ لاتكلوا عن العمل وآية ذلك أن فيهم رجلا له عضد، وليس له ذراع على رأس عضده مثل حلمة الثدي، عليه شعرات بيض، فتذهبون إلى معاوية وأهل الشام، وتتركون هؤلاء يخلفونكم في ذراريكم وأموالكم، والله إني لأرجو أن يكونوا هؤلاء القوم، فأنهم قد سفكوا الدم الحرام، وأغاروا في سرح الناس، فسيروا على اسم الله. قال سلمة بن كهيل: فنزلني زيد بن وهب منزلا حتى قال: مررنا على قنطرة فلما التقينا، وعلى الخوارج يومئذ عبد الله بن وهب الراسبي فقال لهم: ألقوا الرماح، وسلوا سيوفكم من جفونها، فإني أخاف أن يناشدوكم كما ناشدوكم يوم حروراء فرجعوا، فوحشوا برماحهم وسلوا السيوف، وشجرهم الناس برماحهم قال: وقتل بعضهم على بعض، وما أصيب من الناس يومئذ إلا رجلان فقال علي رضي الله عنه: التمسوا فيهم المخدج فالتمسوه، فلم يجدوه فقام علي رضي الله عنه بنفسه حتى أتى ناسا قد قتل بعضهم على بعض قال: أخروهم، فوجدوه مما يلي الأرض فكبر ثم قال: صدق الله وبلغ رسوله قال: فقام إليه عبيدة السلماني فقال: يا أمير المؤمنين! الله الذي لا إله إلا هو لسمعت هذا الحديث من رسول الله ﷺ؟ فقال: إي والله الذي لا إله إلا هو حتى استحلفه ثلاثا وهو يحلف له.