Contradiction with Matthew 5:39
1 Kings 20:8 involves a refusal to submit to enemy demands, while Matthew 5:39 teaches to "turn the other cheek," advocating non-resistance to evil.
Matthew 5:39: But I say unto you, That ye resist not evil: but whosoever shall smite thee on thy right cheek, turn to him the other also.
Contradiction with Romans 12:17
The narrative in 1 Kings 20:8 can be seen as preparing for conflict and violence, whereas Romans 12:17 advises not to repay evil for evil, but to live peacefully.
Romans 12:17: Recompense to no man evil for evil. Provide things honest in the sight of all men.
Contradiction with Proverbs 20:22
Proverbs 20:22 advises against taking personal vengeance, suggesting to "wait on the Lord," while the context of 1 Kings 20:8 involves preparing to confront and resist an adversary immediately.
Proverbs 20:22: Say not thou, I will recompense evil; [but] wait on the LORD, and he shall save thee.
Contradiction with 1 Peter 3:9
While 1 Kings 20:8 details a rejection of oppressive demands, 1 Peter 3:9 encourages believers not to repay evil for evil or insult for insult, but instead to bless others.
1 Peter 3:9: Not rendering evil for evil, or railing for railing: but contrariwise blessing; knowing that ye are thereunto called, that ye should inherit a blessing.