Protecting the religious and moral boundaries of the Shia school and propagating and promoting the teachings of the Ahl al-Bayt (PBUH) owes to the efforts of scholars who, with a correct understanding of their God-given powers and abilities and the definition of their position, Based on the sense of responsibility, in each era and time, they have appropriated a page of Shia history. In the course of the history of the Shia schools, we come across the names of great people who shine like bright stars in one of the fields of research, education, or preaching, or all of them. Undoubtedly, Professor Hossein Ansarian is one of these shining stars.