The Truth About Muhammad: Founder of the World's Most Intolerant Religion (2006) is a controversial book by Robert Spencer, the director of Jihad Watch and Dhimmi Watch.In the book the author proposes to present an account of what Muhammad said and did from the writings of the early biographers of Muhammad such as Ibn Ishaq, Ibn Sa'd al-Baghdadi, Muhammad ibn Jarir al-Tabari as well as the Qur'an and the hadith collections of Bukhari and Muslim.