The Book of Zakat

Sahih Muslim, The Book of Zakat
Book 12, Hadith 204
Narrated 'Zaid b. Wahb Jahani reported and he was among the squadron which wall under the command of Ali (Allah be pleased with him) and which set out (to curb the activities) of the Khwarij. 'Ali (Allah be pleased with him) said:
0 people, I heard the Messeinger of Allah () say: There would arise from my Ummah a people who would recite the Qur'an, and your recital would seem insignificant as compared with their recital, your prayer as compared with their prayer, arid your fast, as compared with their fast. They would recite the Qur'an thinking that it sup- ports them, whereas it is an evidence against them. Their prayer does not get beyond their collar bone; they would swerve through Islam just as the arrow passes through the prey. If the squadron which is to encounter them were to know (what great boon) has been assured to them by their Apostle () they would completely rely upon this deed (alone and cease to do other good deeds), and their (that of the Khwarij) distinctive mark is that there would be (among them) a person whose wrist would be without the arm, and the end of his wrist would be fleshy like the nipple of the breast on which there would be white hair. You would be marching towards Muawiya and the people of Syria and you would leave them behind among your children and your property (to do harm). By Allah, I believe that these are the people (against whom you have been commanded to fight and get reward) for they have shed forbidden blood, and raided the animals of the people. So go forth in the name of Allah (to fight against them). Salama b. Kuhail mentioned that Zaid b. Wahb made me alight at every stage, till we crossed a bridge. 'Abdullah b. Wahb al-Rasibi was at the head of the Khwarij when we encountered them. He ('Abdullah) said to his army: Throw the spears and draw out your swords from their sheaths, for I fear that they would attack you as they attacked you on the day of Harura. They went back and threw their spears and drew out their swords, and people fought against them with spears and they were killed one after another. Only two persons were killed among the people (among the army led by Hadrat 'Ali) on that day. 'Ali (Allah be pleased with him) said: Find out from among them (the dead bodies of the Khwarij) (the maimed). They searched but did not find him. 'Ali (Allah be pleased with him) then himself stood up and (walked) till he came to the people who had been killed one after another. He ('Ali) said: Search them to the last, and then ('Ali's companions) found him (the dead body of the maimed) near the earth. He (Hadrat 'Ali) then pronounced Allah-O-Akbar (Allah is the Greatest) and then said, Allah told the Truth and His Messenger (pbuh) conveyed it. Then there stood before him 'Abida Salmani who said: Commander of the Believers, by Allah, besides Whom there is no god but He, (tell me) whether you heard this hadith from the Messenger of Allah (). He said: Yes, by Allah, besides Whom there is no god but He. He asked him to take an oath thrice and he took the oath.