We are not to fight evil with evil.

God said, it’s his battle. He will repay for the wrong that has been done to us.

But, He does want us to overcome evil, by doing good.

Romans 12:19-21 (KJV) – dearly beloved, avenge not yourselves, but rather give place unto wrath: for it is written, Vengeance is mine; I will repay, saith the Lord. Therefore if thine enemy hunger, feed him, if he thirst, give him drink: for in so doing thou shalt heap coals of fire on his head. Be not overcome of evil, but overcome evil with good.