Contradiction with Matthew 5:44
This verse instructs to love your enemies and bless them, which contradicts the call to muster the troops against the enemies implied in Isaiah 13:2.
Matthew 5:44: But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you;
Contradiction with Romans 12:17
Advises against repaying evil for evil, in contrast to the aggressive mobilization of forces suggested in Isaiah 13:2.
Romans 12:17: Recompense to no man evil for evil. Provide things honest in the sight of all men.
Contradiction with Proverbs 24:17
Encourages not to rejoice when enemies fall, whereas Isaiah 13:2 implies celebration in rallying against adversaries.
Proverbs 24:17: Rejoice not when thine enemy falleth, and let not thine heart be glad when he stumbleth:
Contradiction with Luke 6:27
Advises to do good to those who hate you, opposing the idea of raising a banner against enemies as in Isaiah 13:2.
Luke 6:27: But I say unto you which hear, Love your enemies, do good to them which hate you,
Contradiction with James 4:1
Questions the origin of fights and wars, whereas Isaiah 13:2 actively directs assembling forces for battle.
James 4:1: From whence [come] wars and fightings among you? [come they] not hence, [even] of your lusts that war in your members? [fightings: or, brawlings] [lusts: or, pleasures]