Al -Tabsir in the features of religion or the insight of the premium and the features of the guidance is a book for Muhammad bin Jarir bin Yazid bin Katheer bin Ghaleb, famous for Imam Abu Jaafar Muhammad bin Jarir al -Tabari, and it is a book on the Islamic faith and a statement of something of its origins, and it is a message to the people of the town of Amal Tabaristan; An answer to the people of the town to him, so he explains the principles of religion, which is one of the two books that Al -Tabari wrote to explain in them his beliefs, method and method, namely: insight and frankly Sunnah,