This book, between your hands, is among the masterpieces of the late shaykh Mohammed Husayn al- Muzaffar. The Shaykh was a prominent scholar with outstanding merits. He rendered great services to the Muslim world. Among them is this book he has written on Imam al- Sadiq, peace be on him, to show his uniqe qualities. The book, written in Arabic, was published several times by the Theological School in Najaf. Then it has been published by the Theological School in Qum. Because of the historical importance of the book, we have decided to publish it in English to avail Muslims all over the world. Besides we have shortened some of its subject so as not to be boring. So, gentle reader, read the book carefully and send us your viewpoints and suggestions to put them into effect, for as they say: . Many heads are better than one.This book is one of the many Islamic publications distributed by Ahlulbayt Organization throughout the world in different languages with the aim of conveying the message of Islam to the people of the world. Ahlulbayt Organization (www.shia.es) is a registered Organization that operates and is sustained through collaborative efforts of volunteers in many countries around the world, and it welcomes your involvement and support. Its objectives are numerous, yet its main goal is to spread the truth about the Islamic faith in general and the Shia School of Thought in particular due to the latter being misrepresented, misunderstood and its tenets often assaulted by many ignorant folks, Muslims and non-Muslims. Organization's purpose is to facilitate the dissemination of knowledge through a global medium, the Internet, to locations where such resources are not commonly or easily accessible or are resented, resisted and fought! In addition, For a complete list of our published books please refer to our website (www.shia.es) or send us an email to info@shia.es