Muhammad taught Muslims that invading the Christian city of Constantinople would purge mujahideen of their sins: “The first army amongst my followers who will invade Caesar’s city will be forgiven their sins.”10 Fighting in jihad was so good in Muhammad’s eyes that there is nothing equal to it in this world.11 When a man asked him if there was any deed in this world equal to jihad, Muhammad responded, “I know of no such deed.”12
