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Allah: Messenger Mohammed
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Allah swears by His Glorious, Most Honorable Self, that no one shall attain faith until he refers to the Messenger for judgment IN ALL MATTERS. Thereafter, whatever the Messenger commands, is the plain truth that must be submitted to inwardly and outwardly. Allah said…
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It is not upto any man to name or qualify Allah except with what He or His Messenger Mohammed (p.b.u.h) has named or qualified him. Neither should anyone be named or qualified with the Names or qualifications of Allah e.g. Ar-Rahman - since this would attribute the characteristic of compassion and kindness in its absolute totality to someone other than Allah. But instead one can be named 'Abdur-Rahman' which would translate to 'Servant of the Most Compassionate the Most Kind'.
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Mohammed belonged to a sect called Hunafa who hated the money-making priests and worshipped Allah exclusively. When Mohammed had his vision, the angel Gabriel told him to teach the people, Allah, the God, "One and only, One without rival (p. 225)."
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Messenger Mohammed