An account of the early seventh century comes from Sebeos who was an Armenian bishop of the House of Bagratuni. From this chronicle, there are indications that he lived through many of the events he relates. He maintains that the account of Arab conquests derives from the fugitives who had been eyewitnesses thereof. He concludes with Mu‘awiya’s ascendancy in the Arab civil war (656-61 CE), which suggests that he was writing soon after this date. Sebeos is the first non-Muslim author to present us with a theory for the rise of Islam that pays attention to what the Muslims themselves thought they were doing.
R. G. Hoyland, Seeing Islam As Others Saw It: A Survey And Evaluation Of Christian, Jewish And Zoroastrian Writings On Early Islam, 1997, op. cit., p. 128
As for Muhammad, he has the following to say:
At that time a certain man from along those same sons of Ismael, whose name was Mahmet [i.e., Mụhammad], a merchant, as if by God’s command appeared to them as a preacher [and] the path of truth. He taught them to recognize the God of Abraham, especially because he was learnt and informed in the history of Moses. Now because the command was from on high, at a single order they all came together in unity of religion. Abandoning their vain cults, they turned to the living God who had appeared to their father Abraham. So, Mahmet legislated for them: not to eat carrion, not to drink wine, not to speak falsely, and not to engage in fornication. He said: ‘With an oath God promised this land to Abraham and his seed after him for ever. And he brought about as he promised during that time while he loved Ismael. But now you are the sons of Abraham and God is accomplishing his promise to Abraham and his seed for you. Love sincerely only the God of Abraham, and go and seize the land which God gave to your father Abraham. No one will be able to resist you in battle, because God is with you.
R. W. Thomson (with contributions from J. Howard-Johnson & T. Greenwood), The Armenian History Attributed To Sebeos Part – I: Translation and Notes, 1999, Translated Texts For Historians – Volume 31, Liverpool University Press, pp. 95-96. Other translations can also be seen in P. Crone & M. Cook, Hagarism: The Making Of The Islamic World, 1977, Cambridge University Press: Cambridge, pp. 6-7; R. G. Hoyland, Seeing Islam As Others Saw It: A Survey And Evaluation Of Christian, Jewish And Zoroastrian Writings On Early Islam, 1997, op. cit., p. 129; idem., “Sebeos, The Jews And The Rise Of Islam" in R. L. Nettler (Ed.), Medieval And Modern Perspectives On Muslim-Jewish Relations, 1995, Harwood Academic Publishers GmbH in cooperation with the Oxford Centre for Postgraduate Hebrew Studies, p. 89