Contradiction with Proverbs 15:1
Judges 3:20 depicts violence through deception, whereas Proverbs 15:1 advocates for gentle answers to turn away wrath.
Proverbs 15:1: A soft answer turneth away wrath: but grievous words stir up anger.
Contradiction with Matthew 5:9
Judges 3:20 involves deceit before violence, contradicting the call for peacemakers in Matthew 5:9.
Matthew 5:9: Blessed [are] the peacemakers: for they shall be called the children of God.
Contradiction with Luke 6:27
Judges 3:20 shows aggression against an enemy, whereas Luke 6:27 instructs to love your enemies and do good.
Luke 6:27: But I say unto you which hear, Love your enemies, do good to them which hate you,
Contradiction with Romans 12:19
Ehud takes vengeance personally in Judges 3:20, while Romans 12:19 advises leaving vengeance to God.
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 Exodus 20:13
Judges 3:20 involves killing, in contrast to the commandment "Thou shalt not kill" in Exodus 20:13.
Exodus 20:13: Thou shalt not kill.