Jaʿfar ibn Muhammad al-Sādiq (Arabic: جعفر بن محمد الصادق) (702-765 C.E. or 17th Rabī‘ al-Awwal 83 AH - 25th Shawwāl 148 AH) is believed by the Twelver and Ismaili Shi'a Muslims to be the sixth infallible Imam (to Nizari, fifth), or spiritual leader and successor to the Islamic prophet Muhammad.[4] He is the Imam recognized by both Ismaili and Twelver Shi'a sects and the dispute over who was to succeed him led to a division within Shi'a Islam.[4]
Al-Sadiq is said to be highly respected by both Shia and Sunni Muslims for his great Islamic scholarship, pious character, and academic contributions. Although he is perhaps most famous as the founder of Shia fiqh, known as Ja'fari jurisprudence, he had many other accomplishments. As well as being an Imam on the Shia chain, his presence also graces the Naqshbandi Sufi chain.[5]He was a polymath: an astronomer, alchemist, Imam, Islamic scholar, Islamic theologian, writer, philosopher, physician, physicist and scientist. He was also the teacher of the famous chemist, Jabir ibn Hayyan (Geber),[6][7] and of Abū Ḥanīfa,[8] founder of a Sunni Madh'hab.
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