Contradiction with Proverbs 3:5
Judges 11:3 depicts Jephthah fleeing and relying on his own strength, whereas Proverbs 3:5 advises trusting in the LORD and not leaning on one's own understanding.
Proverbs 3:5: Trust in the LORD with all thine heart; and lean not unto thine own understanding.
Contradiction with Matthew 5:9
Judges 11:3 shows Jephthah gathering vain men leading to conflict, while Matthew 5:9 blesses peacemakers.
Matthew 5:9: Blessed [are] the peacemakers: for they shall be called the children of God.
Contradiction with Romans 12:18
Judges 11:3 involves fleeing and assembling vain men, suggesting conflict; Romans 12:18 encourages living peaceably with all.
Romans 12:18: If it be possible, as much as lieth in you, live peaceably with all men.
Contradiction with Hebrews 10:25
Judges 11:3 illustrates Jephthah isolating himself with worthless men, whereas Hebrews 10:25 urges believers not to forsake assembling together with the faithful.
Hebrews 10:25: Not forsaking the assembling of ourselves together, as the manner of some [is]; but exhorting [one another]: and so much the more, as ye see the day approaching.