One of the best books on the subject of Islamic Monotheism, Sheikh-ul-Islam Muhammad b. Abdul-Wahab's writing Kitaab At-Tawheed ranks high in authenticity. It is a means for guidance of millions of people throughout the world; by taking them out of the darkness of polytheism and error. This text acquaints the Islamic world with the basic teachings of the Qur'an and Sunnah; contradicting false beliefs and customs not supported by the traditions of the Prophet (ﷺ).