Imamah (Shi'a Doctrine)
Imamah (Arabic: إمامة) is the Shia doctrine of religious, spiritual and political leadership of the Ummah. The Shīa believe that the A'immah ("Imams") are the true Caliphs or rightful successors of Muḥammad, and further that Imams are possessed of divine knowledge and authority (‘Iṣmah) as well as being part of the Ahl al-Bayt, the family of Muhammad. This imamas have the role of providing commentary and interpretation of the Quran.
Read more about Imamah (Shi'a Doctrine): Etymology, Introduction, Sects, The Shi'a Twelvers