Contradiction with Exodus 20:13
"Thou shalt not kill" contradicts having vengeance or killing as it was used to justify in 2 Kings 21:24.
Exodus 20:13: Thou shalt not kill.
Contradiction with Matthew 5:44
Encourages loving your enemies, contradicting the notion of taking vengeance seen in 2 Kings 21:24.
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
Advises against taking vengeance, which contrasts with the actions taken by the people in 2 Kings 21:24.
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 24:29
"Say not, I will do so to him as he hath done to me," contradicts the retaliatory action witnessed in 2 Kings 21:24.
Proverbs 24:29: Say not, I will do so to him as he hath done to me: I will render to the man according to his work.
Contradiction with Matthew 5:39
"Resist not evil" since it promotes non-retaliation, in contrast with 2 Kings 21:24's vengeance.
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.