|Ideally, one would like to be able to check such accounts against contemporary evidence||Kafih Jerusalem, 1984 , ch|
|Moreover, many of them provide evidence of embellishment and invention that were introduced to serve the purposes of political or religious apologetic||Peter Teed 1992 , p|
"Muhmmad," Encyclopedia of Islam and the Muslim world• These sources contain internal complexities, anachronisms, discrepancies, and contradictions.19
|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||Ideally, one would like to be able to check such accounts against contemporary evidence|
|"Muhmmad," Encyclopedia of Islam and the Muslim world• Seeing Islam as others saw it: a survey and evaluation of Christian, Jewish, Robert G||sources are not contemporaneous with the events they purport to relate and sometimes were written many centuries later|
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.