シーア派とスンナ派は何故分かれた？
The succession to Muhammad is the central issue that split the Muslim community into several divisions in the first century of Muslim history. A few months before his death, Muhammad delivered a sermon at Ghadir Khumm where he announced that Ali ibn Abi Talib would be his successor. After the sermon, Muhammad ordered the Muslims to pledge allegiance to Ali. Both Shia and Sunni sources agree that Abu Bakr, Umar ibn al-Khattab, and Uthman ibn Affan were among the many who pledged allegiance to Ali at this event. However, just after Muhammad died, a group of approximately fourteen Muslims met at Saqifa, where Umar pledged allegiance to Abu Bakr. Abu Bakr then assumed political power, and his supporters became known as the Sunnis. Despite that, a group of Muslims kept their allegiance to Ali. These people, who became known as Shias, held that while Ali's right to be the political leader may have been taken, he was still the religious and spiritual leader after Muhammad.
succession to Muhammad