Ideally, one would like to be able to check such accounts against contemporary evidence
The Bustan al-Ukul, by Nathanael ibn al-Fayyumi, edited and translated by David Levine, Columbia University Oriental Studies Vol

سيرة النبي محمد صلى الله عليه وسلم

These sources contain internal complexities, anachronisms, discrepancies, and contradictions.

5
محمد
"Muhmmad," Encyclopedia of Islam and the Muslim world• Lapidus 2002 , pp 0
بحث عن حياة الرسول منذ مولده حتى وفاته
Seeing Islam as others saw it: a survey and evaluation of Christian, Jewish, Robert G
أسئلة و أجوبة عن سيرة النبى محمد صلى الله عليه وسلم :: سؤال وجواب حول حياة النبي ⋆ بالعربي نتعلم
sources are not contemporaneous with the events they purport to relate and sometimes were written many centuries later
Hitti, History of the Arabs, 10th edition 1970 , p 597, which notes that many of the details surrounding Muhammad's life as given in the biographies, are "problematic in certain respects, the most important of which is that they represent a tradition of living narrative that is likely to have developed orally for a considerable period before it was given even a relatively fixed written form
137 Netanel's work was virtually unknown beyond his native Yemen until modern times, so had little influence on later Jewish thought• Moreover, many of them provide evidence of embellishment and invention that were introduced to serve the purposes of political or religious apologetic See, for example, Bowersock, Glen Warren, Peter Robert Lamont Brown and Oleg Grabar Late Antiquity: A Guide to the Postclassical World 1999, Harvard University Press p

كتب السيرة النبوية سيرة محمد صلى الله عليه وسلم

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سيرة الرسول صلى الله عليه وسلم كاملة
however, there is no relevant archaeological, epigraphic, or numismatic evidence dating from the time of Muhammad, nor are there any references to him in non-Muslim sources dating from the period before 632
هدي النبي
سيرة النبي محمد صلى الله علية واله وسلم
Denis Gril, Miracles, , Brill, 2007