Contradiction with Matthew 5:44
While Jeremiah 51:3 speaks of destruction and not sparing the enemy, Matthew 5:44 teaches to love your enemies and pray for those who persecute you, which contrasts with the call for vengeance.
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 12:19
Jeremiah 51:3 calls for direct action against enemies, whereas Romans 12:19 advises against seeking personal vengeance and to instead leave it to God's wrath.
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.
Contradiction with Exodus 20:13
Jeremiah 51:3 urges attacking the enemies, but Exodus 20:13 commands "Thou shalt not kill," promoting preservation of life.
Exodus 20:13: Thou shalt not kill.
Contradiction with Proverbs 25:21-22
Encourages kindness to enemies, offering food and drink, contrasting with Jeremiah 51:3's call for attack and eliminating mercy.
Proverbs 25:21-22: If thine enemy be hungry, give him bread to eat; and if he be thirsty, give him water to drink:
Contradiction with Isaiah 2:4
Predicts a time of peace where nations shall not learn war, contradicting Jeremiah 51:3's encouragement of martial action.
Isaiah 2:4: And he shall judge among the nations, and shall rebuke many people: and they shall beat their swords into plowshares, and their spears into pruninghooks: nation shall not lift up sword against nation, neither shall they learn war any more. [pruninghooks: or, scythes]