There is no god worthy of worship except God and Muhammad is His messenger. This declaration of faith is called the Shahada, a simple formula which all the faithful pronounce. In Arabic, the first part is la ilaha illa Llah - 'there is no god except God'; ilaha (god) can refer to anything which we may be tempted to put in place of God - wealth, power, and the like. Then comes illa Llah: 'except God', the source of all Creation. The second part of the Shahada is Muhammadun rasulu'Llah: 'Muhammad is the messenger of God.' A message of guidance has come through a man like ourselves.The Shahada inscribed over entrance to Ottoman Topkapi Palace (the museum contains a mantle worn by the Prophet, among other treasures), Istanbul.