Contradiction with Proverbs 3:29
Judges 9:43 describes an ambush against the people of Shechem, whereas Proverbs 3:29 advises against plotting harm against a neighbor who lives trustfully nearby.
Proverbs 3:29: Devise not evil against thy neighbour, seeing he dwelleth securely by thee. [Devise...: or, Practise no evil]
Contradiction with Matthew 5:44
Judges 9:43 depicts Abimelech's aggressive actions, conflicting with Matthew 5:44, which instructs to love your enemies and pray for those who persecute you.
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 Romans 12:19
Judges 9:43 involves taking vengeance through ambush, while Romans 12:19 advises believers not to avenge themselves but leave room for God's wrath.
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 Romans 14:19
The violent tactics in Judges 9:43 are contrary to Romans 14:19, which encourages pursuing peace and mutual edification.
Romans 14:19: Let us therefore follow after the things which make for peace, and things wherewith one may edify another.
Contradiction with James 1:20
Judges 9:43 shows human anger in action, counter to James 1:20, which asserts that man's anger does not produce the righteousness that God desires.
James 1:20: For the wrath of man worketh not the righteousness of God.