Contradiction with Matthew 5:44
This verse instructs to love your enemies and bless them that curse you, which contradicts Joab's actions in 1 Kings 2:28 where he seeks refuge due to his past actions of 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 Exodus 20:13
The commandment "Thou shalt not kill" contrasts with Joab's history of shedding blood as mentioned in 1 Kings 2:28.
Exodus 20:13: Thou shalt not kill.
Contradiction with Romans 12:19
This verse advises against taking revenge and instead leaving it to God's wrath, contrary to the avenging acts leading up to the events of 1 Kings 2:28.
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 Luke 6:27-28
These verses call for loving and doing good to enemies, contrary to the actions and motivations of Joab culminating in 1 Kings 2:28.
Luke 6:27-28: But I say unto you which hear, Love your enemies, do good to them which hate you,
Contradiction with Leviticus 19:18
This verse commands not to seek revenge, which is at odds with the cycle of violence contributing to the scene in 1 Kings 2:28.
Leviticus 19:18: Thou shalt not avenge, nor bear any grudge against the children of thy people, but thou shalt love thy neighbour as thyself: I [am] the LORD.