In this verse, Allah instructs the believers not to engage in meaningless arguments with the people of the book, i.e. the Jews and the Christians.
And argue not with the people of the Scripture (Jews and Christians), unless it be in (a way) that is better (with good words and in good manner, inviting them to Islamic Monotheism with His Verses), except with such of them as do wrong; and say (to them): “We believe in that which has been revealed to us and revealed to you; our Ilah (God) and your Ilah (God) is One (i.e. Allah), and to Him we have submitted (as Muslims).”
Quran (Surah Al-Ankaboot, Verse 46)