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When the disbelievers said that Muhammad "sallallahu 'alayhi wa sallam" would die, the following was revealed: And We did not assign to any human being before you immortality, permanence [of life] in this world. What, if you [are fated to] die, will they be immortal?, in it? No! (The last sentence constitutes the [syntactical] locus of the interrogative of denial).