Muwatta Malik #1506

Malik related to me from Yahya ibn Said from Said ibn al-Musayyab that a Syrian man called Ibn Khaybari found a man with his wife and killed him, or killed them both. Muawiya ibn Abi Sufyan found it difficult to make a decision and he wrote to Abu Musa al-Ashari to ask Ali ibn Abi Talib for him about that. So Abu Musa asked Ali ibn Abi Talib and AIi said to him, "Is this thing in my land? I adjure you, you must tell me." Abu Musa explained to him how Muawiya ibn Abi Sufyan had written him to ask Ali about it. Ali said, "I am Abu Hasan. If he does not bring four witnesses, then let him be completely handed over," (to the relatives of the murdered man).