"There is no god worthy of worship except God and Muhammad is His messenger"
لا إله إلا الله محمد رسول اللهة‎

This declaration of faith is called the Shahada, one of the five Pillars of Islam.
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.

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