How do Sunni and Shi'i Muslims differ over Muhammad’s successors?

The division between Sunni and Shi'i Muslims originated from a fundamental disagreement regarding the leadership of the Muslim community following the death of the Prophet Muhammad.12

• Sunni Perspective: Sunnis maintain that Muhammad did not designate a successor. Consequently, the community in Medina elected Abū Bakr, a trusted companion and father-in-law of the Prophet, to lead as caliph. In this view, the caliph served in administrative and political capacities rather than religious ones, and the position was filled by human appointment.12

• Shi'i Perspective: The Shi'ah believe that Muhammad explicitly designated his son-in-law and cousin, ‘Alī ibn Abī Ṭālib, as his successor. They hold that ‘Alī and his descendants, the Ahl al-Bayt, possessed a unique, divinely appointed capacity for spiritual authority and religious knowledge (imamate).12

While ‘Alī eventually became the fourth caliph, the initial dispute over his right to lead created a lasting schism that evolved from a political disagreement into distinct theological traditions.13