Contradiction with Exodus 14:13-14
Contradicts by emphasizing that God fights for His people, whereas 1 Kings 20:20 describes the Israelites fighting their enemies.
Exodus 14:13-14: And Moses said unto the people, Fear ye not, stand still, and see the salvation of the LORD, which he will shew to you to day: for the Egyptians whom ye have seen to day, ye shall see them again no more for ever. [for the...: or, for whereas ye have seen the Egyptians to day]
Contradiction with 2 Chronicles 20:17
Contradicts by instructing the Israelites not to fight but to stand still and see the salvation of the Lord, while 1 Kings 20:20 describes active fighting.
2 Chronicles 20:17: Ye shall not [need] to fight in this [battle]: set yourselves, stand ye [still], and see the salvation of the LORD with you, O Judah and Jerusalem: fear not, nor be dismayed; to morrow go out against them: for the LORD [will be] with you.
Contradiction with Matthew 5:44
Contradicts by teaching to love your enemies and do good to them, in contrast to the destruction of enemies in 1 Kings 20:20.
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
Contradicts by urging not to seek vengeance but leave it to God, differing from the direct confrontation described in 1 Kings 20:20.
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 Proverbs 20:22
Contradicts by advising not to say, "I will recompense evil," but to wait for the Lord, which contrasts with the immediate battle actions in 1 Kings 20:20.
Proverbs 20:22: Say not thou, I will recompense evil; [but] wait on the LORD, and he shall save thee.