Abu Ja'far Muhammad ibn Ali ibn al-Husayn al-Saduq, commonly known as Al-Saduq, was a prominent Islamic scholar and theologian born in the 10th century. He is best known for his contributions to Shia Islam, particularly in the field of hadith, which are the sayings and actions of the Prophet Muhammad. Al-Saduq's works helped to compile and preserve important religious texts, making him a key figure in Islamic scholarship. Al-Saduq authored several influential books, including Man La Yahduruhu al-Faqih, which is one of the four major hadith collections in Shia Islam. His scholarship emphasized the importance of authentic sources and rational thought in understanding religious teachings. Al-Saduq's legacy continues to impact Islamic studies and the development of Shia thought today.