"IN WHAT CAME TO BE KNOWN as his farewell address, Muhammad is said to have told his followers: "I was ordered to fight all men until they say 'There is no god but Allah.'"1 This is entirely consistent with the Qur'an (9:5) : "[S]lay the idolaters wherever ye find them, and take them [captive], and besiege them, and prepare for them each ambush." In this spirit, Muhammad's heirs set out to conquer the world."