Contradiction with Matthew 5:39
While Nahum 3:14 instructs preparation for defense, Matthew 5:39 teaches turning the other cheek instead of resisting an evildoer.
Matthew 5:39: But I say unto you, That ye resist not evil: but whosoever shall smite thee on thy right cheek, turn to him the other also.
Contradiction with Romans 12:19
Nahum 3:14 suggests self-defense and preparation, whereas Romans 12:19 advises against taking vengeance and instead leaving it to God.
Romans 12:19: Dearly beloved, avenge not yourselves, but [rather] give place unto wrath: for it is written, Vengeance [is] mine; I will repay, saith the Lord.