During the Battle of Sıffin which occurred between Ali b. Abi Talib, who became caliph after the murder of the Caliph Uthman, and Muawiya b. Abi Sufyan thousands of people from both sides had been killed. At the very crucial point of the battle, idea of arbitration was put forward by Amr b. al-As. Two arbitrators had met and made long discussions. At the end, they came to decision that both Ali and Muawiya would be removed from the caliphate and the new caliph would be elected as a result of consultation among the Muslims. They announced this decision together. Although there had been many narrations on the fact that Amr deceived Abu Musa at the time of announcement of the decision, they are baseless. In this research, various narrations on this important event were studied and evaluated