Moulavi Gerágh Ali, A Critical Exposition of the Popular 'Jihád'…
“ The story is not to be found in any of these biographies, nor in the canonical collections of Bokhari, Muslim, and Tirmizee. Sir W. Muir had himself laid down the rule that only these original authorities are to be depended upon, and the later authors are to be rejected. He writes:—"To the three biographies by Ibn Hishám, by Wackidi his secretary, and Tabari, the judicious historian of Mahomet will, as his original authorities, confine himself. ”
