Essentials of Bid'ah forms the second and the third section of the book titled: Da'watu Ahl-Bid'ah (Inviting the People Of Innovations). In a very concise manner Shaykh Khalid bin Ahmad Az Zahraanee expounded on both the lexical and juristic meaning of the word Bid'ah, it's evil effects and the words of disparagement, categories of Bid'ah, dealing with the people of Bid'ah, that has been mentioned in the Qur'an, the Sunnah of the Prophet, the statements and actions of the Companions and those who follow in their footsteps from the scholars over time regarding Bid'ah and its people.