The Book of Tawḥīd by Imam Muhammad ibn ʻAbd al-Wahhab is considered one of the most important books on belief and Tawḥīd. It includes chapters on this science and includes verses from the Qur’an, hadiths, and the sayings of prominent scholars. His grandson, Sheikh Sulayman ibn ʻAbdullah, came to write this unique commentary on the Book of Tawḥīd, providing a lengthy explanation of the book, analyzing the terms, clarifying the unfamiliar words, and citing verses and hadiths that support the author's arguments. He also further clarified the doctrinal rulings contained in the Book of Tawḥīd.