The Length of his Mission and his Life.—All historians agree that the time of his mission amounted to one hundred years—fifty before and fifty after the destruction of the tribe. According to the most correct statements, he lived four hundred and sixty-four years, or three hundred and forty-three years according to the tradition of Christian U’lamâ; one hundred and fifty years according to some commentators, but according to another opinion four hun­dred and eighty years. Allah, however, knows bests.