section_path: Major denominations or branches/Twelver/Jurisprudence
section_name: Jurisprudence
paragraph_text: Jurisprudence
  
  The Twelver jurisprudence is called Jaʽfari jurisprudence. In this school of Islamic jurisprudence, the sunnah is considered to be comprehensive of the oral traditions of Muhammad and their implementation and interpretation by the Twelve Imams. There are three schools of Jaʿfari jurisprudence: Usuli, Akhbari, and Shaykhi; the Usuli school is by far the largest of the three. Twelver groups that do not follow the Jaʿfari jurisprudence include Alevis, Bektashi, and Qizilbash.
  
  The five pillars of Islam to the Jaʿfari jurisprudence are known as Usul ad-Din:
  
  In Jaʿfari jurisprudence, there are eight secondary pillars, known as Furu ad-Din, which are as follows:
  
  According to Twelvers, defining and interpretation of Islamic jurisprudence (fiqh) is the responsibility of Muhammad and the Twelve Imams. Since the 12th Imam is currently in Occultation, it is the duty of Shīʿīte clerics to refer to the Islamic literature, such as the Quran and hadith, and identify legal decisions within the confines of Islamic law to provide means to deal with current issues from an Islamic perspective. In other words, clergymen in Twelver Shīʿīsm are believed to be the guardians of fiqh, which is believed to have been defined by Muhammad and his twelve successors. This process is known as ijtihad and the clerics are known as marjaʿ, meaning "reference"; the labels Allamah and Ayatollah are in use for Twelver clerics.