Therefore...

Therefore, the book was written with two different methods that differ in their elaboration as well as in the way they cite hadiths. Position of the book Tahdhib al-ahkam counts as the most important source of ijtihad for Imamiyya in virtue of its containing much more hadiths in comparison with the rest of the Four Books (al-Kutub al-Arba’a).

Its Importance in Fiqh According to Bahr al-‘Ulum, with this book a scholar of fiqh does not usually need to refer to any other collection of hadiths; a feature lacked by the rest of the Four Books. Sayyid b. Tawus took al-Kafi and Tahdhib al-ahkam to be the greatest books in fiqh, and ‘Allama al-Hilli took the book to be the origin of fiqh, which is, together with al-Muqni’a, one of the greatest sources in fiqh. In many parts or…