Question: what is the difference between the sunni version of the shahada and the shi'ite version?
Answer: The Shia version of the Shahada, the Islamic profession of faith, differs from that of the Sunni. The Sunni Shahada states There is no god except God, Muhammad is the messenger of God, but to this the Shia append Ali is the Wali (custodian) of God, علي ولي الله.