Do not argue with the People of the Scripture except in a way that is best
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There are guidelines for the valid argument under the Sharia including: sticking to the good manners, kindness and softness of words, calling to the truth, rejecting the falsehood, and that the purpose of the argument is not merely arguing with and defeating the opponent.
Allah said ( interpretation of the meaning ) :
{ And do not argue with the People of the Scripture except in a way that is best, except for those who commit injustice among them, and say, "We believe in that which has been revealed to us and revealed to you. And our God and your God is one; and we are Muslims [in submission] to Him }
AL‑‘ANKABŪT (46)