Al-Istibsar is a significant work in Islamic scholarship, particularly within the Shia tradition. Authored by Sheikh Abu Ja'far Muhammad ibn al-Hasan al-Tusi, it serves as a comprehensive collection of hadiths, which are sayings and actions of the Prophet Muhammad and his family. The book aims to clarify and interpret various Islamic laws and principles. The title "Al-Istibsar" translates to "The Clarification," reflecting its purpose of providing insights into complex religious issues. It is considered one of the four major hadith collections in Shia Islam, alongside Al-Kafi, Man La Yahduruhu al-Faqih, and Tahdhib al-Ahkam.