The Holy Prophet Mohammad (peace and blessings of Allah be upon him and his purified progeny) is introduced in the Qur’ān as an interpreter, teacher, and explainer of the Qur’ānic verses and religious knowledge. After the Messenger of Allah, his Ahl al-Bayt (the Prophet's purified family) have always been guides for the people as the most knowledgeable individuals regarding the Book of Allah and the Sunnah of the Messenger of Allah. Like the Holy Prophet (peace and blessings of Allah be upon him and his purified progeny), they have explained the knowledge of the Qur’ān and religion to the people and, in reality, have been responsible for the leadership of Muslims. By referring to the Holy Qur’ān and authentic Shia and Sunni commentaries, one can clearly observe the scholarly position of the Holy Imams (peace be upon them), who, among all the companions, successors, scholars, and great figures of various Islamic schools of thought, held a special and unique position, and as a reliable authority and an endless source of knowledge, they have always been a point of reference for the people.