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  that style has prevailed ever since. One of the most valuable collections is
  the Commentary compiled by Soyuty as late as the tenth century.
     
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  The following is Sprenger's estimate of the value of the Commentaries, as
  bearing on the biography of Mahomet: 
     
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    We are concerned here, not with
    the degree in which these writers illustrated the Coran, but with the
    accounts they contain of Mahomet's life. The traditions of this nature which
    they have preserved are so numerous and so detailed, that (excepting only
    the two points of chronology and the campaigns) it were an easier task to
    compile a life of Mahomet without the "Biographies," than without
    the "Commentaries." Their statements, further, are somewhat more
    trustworthy, for they were committed to writing at a much earlier period;
    and if their prejudices were deeper and more numerous, still they were of a
    different sort. They were also obliged to make mention of many incidents
    because of allusions to them in the Coran, which the Biographers pass over
    in silence. The Commentators, taken in conjunction with the Biographers,
    even where both are untrue, often enable us to pierce deeper into the real
    facts, or at least to detect untruthfulness. Moreover, although the
    Commentaries may have been always taken advantage of by the Biographers, it
    is not a sufficient reason for us to pass by the former, simply that the
    latter may have taken from them as much as served their own purpose (iii. p.
    cxx.).
     
   
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  The judgment of Sprenger is here, as elsewhere, tinged with prejudice against
  the Biographers. The Commentators in fact, as guides, are singularly unsafe.
  To illustrate allusions in the Coran they are ever ready with a story in
  point: but unfortunately there are almost always several different tales, all
  equally apposite to the same matter. The textual allusion, in fact, was often
  the father of the story. What was originally perhaps a mere conjecture of
  supposed events giving rise to an expression in the Coran, or a simple surmise
  in explanation of some passage, by degrees assumed the garb of fact. Thus the
  imaginary tradition and the facts which it professes to attest, often rest
  without doubt on no better authority than that of the verse or passage itself.
  Moreover, whatever really valuable traditional matter is to be found in the
  Commentaries, was made use of by the Biographers. We can hardly point to a
  single event in the life of the Prophet, which rests upon the independent,
  evidence of the Commentators.
     
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