Contradiction with Proverbs 16:7
Explains that when a man's ways please the Lord, he makes even his enemies to be at peace with him, contrasting the continual conflicts in 2 Samuel 20.
Proverbs 16:7: When a man's ways please the LORD, he maketh even his enemies to be at peace with him.
Contradiction with James 3:18
Highlights that peacemakers sow in peace and reap a harvest of righteousness, opposing the violence and unrest depicted in 2 Samuel 20.
James 3:18: And the fruit of righteousness is sown in peace of them that make peace.
Contradiction with Romans 12:18
Advises living peaceably with all men, as much as possible, conflicting with Joab's actions in 2 Samuel 20.
Romans 12:18: If it be possible, as much as lieth in you, live peaceably with all men.
Contradiction with Matthew 5:9
Declares blessed are the peacemakers, whereas 2 Samuel 20 portrays conflict and aggression.
Matthew 5:9: Blessed [are] the peacemakers: for they shall be called the children of God.
Contradiction with Isaiah 2:4
Speaks of beating swords into plowshares, contrasting the militaristic pursuits in 2 Samuel 20.
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]