Tahdhib al-Ahkam (Arabic: تَهْذِيب ٱلَأَحْكَام فِي شَرْح ٱلْمُقْنِعَة, romanized: Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿa, lit.

[1][2] Tahdhib al-Ahkam is translated by Ludwig W. Adamec as confirmation of decision[3] and by I.K.A Howard as The Refinement of the Laws (as Discussed).

[5] Al-Istibsar is one of the four major Shia collections of Hadith (Persian: الكتب الاربعة) authored by Shaykh Tusi.

Due to his nomination at the introduction of Tahdhib al-Ahkam,[4] he wrote the book as a commentary on the Al-Muqni'ah for solving the crisis of contradiction in the Shia Islamic seminary in response to his friend request.

According to viewpoint of Ali Nasiri, Shaykh Tusi authored this book basis on the six phases:[7] Therefore, Shaykh Tusi proceeded to his work in three step:[7] Tahdhib al-Ahkam contains the following:[4] According to Najaf publication, Tahdhib al-Ahkam included 409 chapters, 13988 traditions and according to the counting of Muhaddis Noori it included 393 chapters, 13590 traditions.