﴿ وَيَقُولُ ٱلَّذِينَ كَفَرُوا۟ لَسْتَ مُرْسَلًۭا ۚ قُلْ كَفَىٰ بِٱللَّهِ شَهِيدًۢا بَيْنِى وَبَيْنَكُمْ وَمَنْ عِندَهُۥ عِلْمُ ٱلْكِتَٰبِ ﴾

“And [if] they who are bent on denying the truth say [unto thee, O Prophet], "Thou hast not been sent [by God]", say thou: "None can bear witness between me and you as God does; and [none can bear witness as does] he who truly understands this divine writ.”

And those who disbelieve say to you ‘You have not been sent by God!’ Say to them ‘God suffices as a witness between me and you to my truthfulness as a messenger and he who possesses knowledge of the Book’ from among the Christian and Jewish believers.