Some people believed that it should have been - Abu Bakr who was Muhammad’s close friend. Some believed that it should be his Son in law Ali.Ali became the successor but he was assassinate. This led to the major split in Islam this is known as Schism. 2 groups Sunni and Shia Muslims. 90 % of Muslims were Sunni - Qur’an is the leadership source/leader = not a descendant.Believed that Muhammad was the last and greatest prophet.