Contradiction with Matthew 5:44
This verse advises to love your enemies and do good to those who hate you, which contradicts the violent scene in 2 Samuel 20:12.
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" stands in contrast to the act of Joab killing Amasa in 2 Samuel 20:12.
Exodus 20:13: Thou shalt not kill.
Contradiction with Romans 12:19
This verse warns against taking revenge, stating vengeance belongs to God, contrasting with the act of revenge seen in 2 Samuel 20:12.
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 24:17
Advises not to rejoice when your enemy falls, conflicting with the aftermath and potential triumph seen in 2 Samuel 20:12.
Proverbs 24:17: Rejoice not when thine enemy falleth, and let not thine heart be glad when he stumbleth:
Contradiction with Luke 6:27
Encourages love and compassion toward enemies, opposing the ruthless action in 2 Samuel 20:12.
Luke 6:27: But I say unto you which hear, Love your enemies, do good to them which hate you,