Al-Ibtisar & Tahdib al-ahkam
Muḥammad b. al-Ḥasan b.ʿAlī b. al-Ḥasan or also known as al-Shaykh al-Ṭūsī, born in Ramadan, 385, in Tus near Mashhad. Al-Ṭūsī was given the title of al-Shaykh al-Ṭāʾifa, which translates to the head of the Shi’a, due to his contributions in the field of theology and tafsir. Al-Ṭāʾifa was known not only for his hadith compilations, but was also known to be one of the greatest Shi’a faqih’s. At the age of 23, al-Ṭāʾifa, moved to Iraq to study under al-Shaykh al-Mufid and al-Sharif al-Murtada, in which he became marja’ of the Shi’a after the demise of al-Sharif al-Murtada. Two most notable scholarly works by al-Shaykh al-Ṭāʾifa are two of the four renowned Shi’a books, al-Ibtisar and Tahdib al-ahkam.
Both al-Ibtisar and Tahdib al-ahkam focus on hadiths pertaining to jurisprudence, and the latter of the two also contains laws of sharia conveyed from the Ahlul-Bayt. Tahdib al-ahkam is considered to be one of the most reliable Shi’a hadith books, as al-Shaykh al-Ṭūsī derived his sources from the Quran, authenticated hadith, as well as obtaining hadith from well-known companions of the Imams. Al-Ibtisar, which also focuses on fiqh, dedicated its first two parts to issues regarding worship and the third part concerns issues such as contracts, fixed punishments, and other jurisprudential issues.