Sayyiduna Abdullah bin Amr (may Allah be pleased with him) narrates that two men brought their case to the Prophet Muhammad (peace and blessings be upon him). The Prophet (peace and blessings be upon him) said to Sayyiduna Amr bin al-As (may Allah be pleased with him): "You decide between the two of them." He said: "O Messenger of Allah! In your presence?" The Prophet (peace and blessings be upon him) said: "Yes!" He said: "How should I decide?" The Prophet (peace and blessings be upon him) said: "If you exercise ijtihad and make the correct decision, you will have ten rewards, and if you exercise ijtihad and make a mistake, you will have one reward."