“(O Muhammad), you were then not on the western side when We bestowed this commandment [of Law], on Moses and you were not among its witnesses…. You were then not even present among the people of Midian to rehearse Our verses to them. But it is We Who are sending news about that. Nor were you on the side of the Mount (Sinai) when We called out to Moses (in the first instance). But it is mercy from your Lord (that you are being informed of all this) so that you may warn a people to whom no warner came before you. Maybe they will take heed.”
(Al Qur’ān – 28:44-46)
These ayaat present three things by way of proof of Muhammad’s Prophethood. At the time of the revelation of these ayaat, the unbelievers were bent upon proving that Muhammad ﷺ was a false claimant to Prophethood. In this vicious campaign they enjoyed the support of Jewish scholars and Christian monks who lived in various parts of Ḥijāz. At the same time, the fact was that the Prophet Muhammad ﷺ had not suddenly appeared among them as if from nowhere. He was a resident of the same city, and the Makkans knew about each and every aspect of his life.
For this reason, when these three proofs of his Prophethood were presented with an open challenge to any detractors, not a single person came forward with anything which proved that the Prophet ﷺ had drawn his information from any identifiable source other than that of Revelation.