|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|
|Lapidus 2002 , pp 0||Denis Gril, Miracles, , Brill, 2007|
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||Hitti, History of the Arabs, 10th edition 1970 , p|
|Seeing Islam as others saw it: a survey and evaluation of Christian, Jewish, Robert G||The Bustan al-Ukul, by Nathanael ibn al-Fayyumi, edited and translated by David Levine, Columbia University Oriental Studies Vol|
Ideally, one would like to be able to check such accounts against contemporary evidence.