Contradiction with Proverbs 16:7
While 1 Kings 20:26 describes preparations for battle against Israel, Proverbs 16:7 suggests that when a man's ways please the Lord, He makes even his enemies to be at peace with him.
Proverbs 16:7: When a man's ways please the LORD, he maketh even his enemies to be at peace with him.
Contradiction with Matthew 5:9
1 Kings 20:26 involves plans for conflict, whereas Matthew 5:9 blesses peacemakers, indicating a contrast between war and promoting peace.
Matthew 5:9: Blessed [are] the peacemakers: for they shall be called the children of God.
Contradiction with James 4:1
1 Kings 20:26 describes the practical preparations for war, while James 4:1 questions the source of wars and fighting as stemming from internal lusts and conflicts.
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]
Contradiction with Isaiah 2:4
1 Kings 20:26 involves arranging an army for battle, but Isaiah 2:4 speaks of a time when nations will not learn war anymore, promoting peace over conflict.
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]
Contradiction with Romans 12:18
The verse in 1 Kings describes gearing up for war, contradicting Romans 12:18, which urges living peaceably with all men as much as possible.
Romans 12:18: If it be possible, as much as lieth in you, live peaceably with all men.