Contradiction with Exodus 20:13
While 2 Chronicles 23:15 describes an act of killing, Exodus 20:13 commands "Thou shalt not kill," directly opposing the act of execution.
Exodus 20:13: Thou shalt not kill.
Contradiction with Matthew 5:44
2 Chronicles 23:15 involves the execution of a person, whereas Matthew 5:44 instructs to "Love your enemies," promoting love rather than violence.
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 John 8:7
In 2 Chronicles 23:15, punishment is carried out, whereas in John 8:7, Jesus teaches, "He that is without sin among you, let him first cast a stone," advocating against judging and executing others.
John 8:7: So when they continued asking him, he lifted up himself, and said unto them, He that is without sin among you, let him first cast a stone at her.
Contradiction with Romans 12:19
2 Chronicles 23:15 involves humans enacting vengeance, but Romans 12:19 says, "Vengeance is mine; I will repay, saith the Lord," advising against taking vengeance personally.
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.