Sunnism is the movement within Islam with the most adherents and the largest distribution area.
Sunni Muslims follow the tradition based on the life of Islam's last prophet, Muhammad. The Hadith, a collection of traditions of the speech, action and approvals of Muhammad, has great authority for Sunnis in addition to the Muslim holy book, the Qur'an.
Sunnism, like Shiism, arose from the struggle for the rightful succession to Muhammad, which began after his death in AD 632. The Sunnis assume that Muhammad did not designate a successor during his lifetime, nor did he indicate how a successor had to be determined.
The struggle was between supporters of Muhammad's nephew and son-in-law Ali and those of the caliphs. The Sunnis are followers of the latter. The first caliph was Muhammad's father-in-law Abu Bakr.
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