The Quran

۞ وَلا تُجادِلوا أَهلَ الكِتابِ إِلّا بِالَّتي هِيَ أَحسَنُ إِلَّا الَّذينَ ظَلَموا مِنهُم ۖ وَقولوا آمَنّا بِالَّذي أُنزِلَ إِلَينا وَأُنزِلَ إِلَيكُم وَإِلٰهُنا وَإِلٰهُكُم واحِدٌ وَنَحنُ لَهُ مُسلِمونَ

Muhammad Asad

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 evildoing¹ - 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: for our God and your God is one and the same, and it is unto Him that We [all] surrender ourselves."

Sc., "and are therefore not accessible to friendly argument": the implication being that in such cases all disputes should a priori be avoided. As regards religious discussions in general, see note 149 on 16:125.