﴿ ۞ وَلَا تُجَٰدِلُوٓا۟ أَهْلَ ٱلْكِتَٰبِ إِلَّا بِٱلَّتِى هِىَ أَحْسَنُ إِلَّا ٱلَّذِينَ ظَلَمُوا۟ مِنْهُمْ ۖ وَقُولُوٓا۟ ءَامَنَّا بِٱلَّذِىٓ أُنزِلَ إِلَيْنَا وَأُنزِلَ إِلَيْكُمْ وَإِلَٰهُنَا وَإِلَٰهُكُمْ وَٰحِدٌۭ وَنَحْنُ لَهُۥ مُسْلِمُونَ ﴾

“And do not argue with the followers of earlier revelation otherwise than in a most kindly manner - unless it be such of them as are bent on evildoing and say: “We believe in that which has been be­stowed from on high upon us, as well as that which has been bestowed upon you: or our God and your God is one and the same, and it is unto Him that We [all] surrender ourselves.””

Rather than become entangled in unnecessary discussions and bickering, it is best if the preacher (da‘i) greets his antagonists formally and then avoids them. But, to those who are sincere and serious, he should try to explain and clarify the Truth. Furthermore, the preacher’s words should be full of wisdom—a wisdom made manifest in the way he takes into account the mental make-up of the addressee. He should present his message in a way which appeals to the addressee, so that his mind is addressed. The message should consist of sound advice and should not be argumentative.