not use the Kutub al-Sittah (six major hadith collections) followed by Sunni Islam, therefore the sunnah of Shia Islam and the sunnah of Sunni Islam refer to different collections of religious canonical literature. The primary collections of sunnah of Shia Islam were written by three authors known as the 'Three Muhammads', and they are: Kitab al-Kafi by Muhammad ibn Ya'qub al-Kulayni al-Razi (329 AH), Man la yahduruhu al-Faqih by Ibn Babawayh and Tahdhib al-Ahkam, and Al-Istibsar both by Shaykh Tusi. Unlike Akhbari Twelver Shiites, Usuli Twelver Shiite scholars do not believe that everything in the four major books of the sunnah of Shia Islam is authentic. In Shia hadees one often finds sermons attributed to Ali in The Four Books or in the Nahj al-Balagha. See also Bid‘ah Categories of Hadith Sharia References Notes Citations Further reading Hamza, Feras, "Sunna", in Muhammad in History, Thought, and Culture: An Encyclopedia of the Prophet of God (2 vols.), Edited by C. Fitzpatrick and A. Walker, Santa Barbara, ABC-CLIO, 2014, Vol II, pp. 610–619. External links The Sunna as Primordiality by Sheikh Abdal Hakim Murad The Meaning of "Sunna" in the Qur’an, Qur'anic Studies Sunnah and Hadith, Center For Muslim–Jewish Engagement 5 Actionalbe Sunnah backed by science Islamic terminology Sunni Islam