a descendant of Ali from his father's side and a descendant of Fatimah from his mother's side and was himself a prominent Muslim jurist.
He is revered as an imam by the adherents of Shi'a Islam and Alevism and as a renowned Islamic scholar and personality by Sunni Muslims. The Shi'a Muslims consider him to be the Sixth Imam or leader and spiritual successor to Muhammad. Sunni sources claim that doctrines such as the Imamate were formulated many years after al-Sadiq and wrongly ascribed to him. The internal dispute over who was to succeed Ja'far as imam led to schism within Shi'a Islam. Al-Sadiq was celebrated among his brothers and peers and stood out among them for his great personal merits. He is highly respected by both Sunni and Shi'a Muslims for his great Islamic scholarship, pious character, and academic contributions