Contradiction with Matthew 5:44
While 1 Kings 20:19 describes an act of war, Matthew 5:44 instructs to love your enemies and do good to them.
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 Exodus 20:13
This verse commands "Thou shalt not kill," conflicting with the military action described in 1 Kings 20:19.
Exodus 20:13: Thou shalt not kill.
Contradiction with Romans 12:17
Romans advises to "recompense to no man evil for evil" which is contrary to the battle strategy in 1 Kings 20:19.
Romans 12:17: Recompense to no man evil for evil. Provide things honest in the sight of all men.
Contradiction with Isaiah 2:4
Isaiah prophesies a time of peace where nations will not learn war anymore, differing from the conflict in 1 Kings 20:19.
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 Matthew 26:52
Jesus says "all they that take the sword shall perish with the sword," contrasting the battle scene in 1 Kings 20:19.
Matthew 26:52: Thinkest thou that I cannot now pray to my Father, and he shall presently give me more than twelve legions of angels?