Contradiction with Matthew 10:14
This verse suggests shaking off the dust from your feet if people don't accept your teachings, while Acts 18:4 discusses reasoning and persuading consistently in the synagogue.
Matthew 10:14: And whosoever shall not receive you, nor hear your words, when ye depart out of that house or city, shake off the dust of your feet.
Contradiction with Matthew 7:6
This verse advises not to give what is holy to dogs, implying a limit to persuasion, contrasting with the persistent reasoning in Acts 18:4.
Matthew 7:6: Give not that which is holy unto the dogs, neither cast ye your pearls before swine, lest they trample them under their feet, and turn again and rend you.
Contradiction with Titus 3:10
This verse advises rejecting a divisive person after a first and second admonition, while Acts 18:4 shows continual attempts to persuade.
Titus 3:10: A man that is an heretick after the first and second admonition reject;