Contradiction with Ephesians 4:31
This verse advises against bitterness, wrath, anger, clamor, and evil speaking, contradicting the anger and potential for bitterness shown by Joab in 2 Samuel 14:31.
Ephesians 4:31: Let all bitterness, and wrath, and anger, and clamour, and evil speaking, be put away from you, with all malice:
Contradiction with 1 Corinthians 13:4-5
These verses describe love as patient and not easily angered, contrasting with Joab's response to his fields being set on fire in 2 Samuel 14:31.
1 Corinthians 13:4-5: Charity suffereth long, [and] is kind; charity envieth not; charity vaunteth not itself, is not puffed up, [vaunteth...: or, is not rash]
Contradiction with Proverbs 15:1
This verse suggests a soft answer turns away wrath, contrasting with the implied anger and confrontation in 2 Samuel 14:31.
Proverbs 15:1: A soft answer turneth away wrath: but grievous words stir up anger.
Contradiction with Matthew 5:44
This verse encourages loving enemies and those who wrong us, contrasting with Joab's likely anger and confrontation in 2 Samuel 14:31.
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;