This battle however did not entirely finish the tension in the Muslim empire. Ali was soon challenged by Muawiyah, the governor of the Muslim provinces of Syria. He too raised the issue of punishing Uthman's murderers and refused to acknowledge Ali as caliph until the issue had been solved. Muawiyah was a kinsman of Uthman and his army pledged to bring to justice the murderers and those who sheltered them. This reference to people who are sheltering the murderers was towards Ali and his followers. Accordingly, the two groups met and fought a battle, called the "Battle of Siffin". This battle ended in a draw and so both groups decided on arbitration which also did not lead to any concrete decision. Another group of Muslims, "The Kharijites" who had previously been with Ali, meanwhile rejected him because they felt that he was not following true Islam and conducting business over the caliphate as if it were his own property.