بسم الله الرحمن الرحیم

the holy Quran

sura: Ankaboot          verse: 46

Do not argue with the People of the Book(christians and jews) except in a manner which is best, except such of them as are wrongdoers

and say, ‘We believe in what has been sent down to us and in what has been sent down to you; our God and your God is one [and the same] and to Him(Allah) we are submissive