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Why did Shi'i Muslims regard Ali and his descendants as rightful leaders?

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Map showing the extent of the Abbasid caliphate in the 9th century, with regions under direct Abbasid rule shaded in green, and surrounding areas under Abbasid suzerainty or controlled by other dynasties-Aghlabids of Tunisia, Idrisids of Morocco, Tahirids in the east, and the Umayyad emirate of Spain-indicated in different colors. Major cities such as Baghdad, Cairo, Mecca, and Cordoba are labeled, along with key regional boundaries.
Caliphate

Shi'i Muslims regard Ali ibn Abi Talib and his descendants as the rightful leaders of the Muslim community based on the belief that the Prophet Muhammad explicitly designated Ali as his successor.12

This conviction is rooted in several key factors:

  • Divine Designation: Shi'i tradition emphasizes the event at Ghadir Khumm in 632, where the Prophet declared, "Whoever takes me as his mawla, Ali shall be his mawla." While interpretations of mawla vary, the Shi'ah interpret this as the formal investiture of Ali as the first imam.23
  • Family Lineage: The Shi'ah believe that spiritual and political authority was intended to remain within the Prophet’s family, known as the Ahl al-Bayt.12
  • Superior Knowledge: They hold that Ali and his descendants possessed a special capacity for superior religious knowledge (ilm), which entitled them to absolute spiritual authority over the ummah.4

Following Ali's death, his partisans sought to preserve this leadership among his descendants, viewing them as the legitimate heirs to the Prophet's spiritual legacy.42