Yehuda D. Nevo

"Since external evidence is necessary to corroborate a view derived solely from the Muslim literary account, lack of such corroboration is an important argument against that account's historicity. This approach is therefore more open than the 'traditional' to acceptance of an argumentum e silentio. For if we are ready to discount an uncorroborated report of an event, we must accept that there may be nothing with which to replace it: that the event simply did not happen. That there is no evidence for it outside of the "traditional account" thus becomes positive evidence in support of the hypothesis that it did not happen. A striking example is the lack of evidence, outside the Muslim literature, for the view that the Arabs were Muslim at the time of the Conquest."