Fa in haaajjooka faqul aslamtu wajhiya lillaahi wa manit taba'an; wa qul lillazeena ootul Kitaaba wal ummiyyeena 'a-aslamtum; fa in aslamoo faqadih tadaw wa in tawallaw fa innamaa 'alaikal balaagh; wallaahu baseerum bil 'ibaad (ʾĀl ʿImrān 3:20)
So if they argue with you, say, "I have submitted myself to Allah [in IsLam], and [so have] those who follow me." And say to those who were given the Scripture and [to] the unlearned, "Have you submitted yourselves?" And if they submit [in IsLam], they are rightly guided; but if they turn away – then upon you is only the [duty of] notification. And Allah is Seeing of [His] servants. (Ali 'Imran [3] : 20)