Kitab At-Tauhid which is one of the best books on the subject of Tawheed (Tauheed, Tawhid - Monotheism) and ranks high in authenticity. In this book all the relevant verses of the Qur'an have been discussed reasonably, rationally, and sincerely. The essence of the Qur'an and Sunnah is placed in a very simple manner in this book.