Contradiction with Matthew 5:9
This verse blesses peacemakers, which contradicts Joab's willingness to pursue conflict.
Matthew 5:9: Blessed [are] the peacemakers: for they shall be called the children of God.
Contradiction with Proverbs 12:20
This verse speaks of joy for those who promote peace, contrasting with the pursuit of war in 2 Samuel 20:20.
Proverbs 12:20: Deceit [is] in the heart of them that imagine evil: but to the counsellors of peace [is] joy.
Contradiction with James 3:18
Emphasizes the fruit of righteousness being sown in peace, conflicting with Joab's readiness for violence.
James 3:18: And the fruit of righteousness is sown in peace of them that make peace.
Contradiction with Isaiah 2:4
Prophecy about turning swords into plowshares, promoting peace contrary to Joab's militaristic stance.
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]