Ooh, we're getting into the Bible quote throwing game! How about this:
"But I tell you that anyone who is angry with his brother will be subject to judgment. Again, anyone who says to his brother, 'Raca,' is answerable to the Sanhedrin. But anyone who says, 'You fool!' will be in danger of the fire of hell."
SCORE!!
Now a good comeback would be,"The devil can cite Scripture for his purpose," but sadly that's from Shakespeare and not the Bible.
That would be near the prohibition on swearing oaths. It's interesting how literalists pick and choose what they want to take seriously.