Phil.1.28  and not frightened in anything by your opponents. This is a clear omen to them of their destruction, but of your salvation, and that from God.
2Tim.2.25  correcting his opponents with gentleness. God may perhaps grant that they will repent and come to know the truth,
Titus.2.8  and sound speech that cannot be censured, so that an opponent may be put to shame, having nothing evil to say of us.

Hyper-concordance v1.1, by Sean Boisen. Scripture verses taken from the Revised Standard Version, copyright 1952, 1971.