Contradiction with Matthew 10:14
This verse advises leaving a place where one is not received, whereas Acts 18:19 shows Paul entering a synagogue to reason, despite varying reception from Jews.
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 Acts 13:50-51
Paul and Barnabas were expelled and shook off the dust of their feet against a city, contrasting Acts 18:19 where Paul willingly goes into the synagogue.
Acts 13:50-51: But the Jews stirred up the devout and honourable women, and the chief men of the city, and raised persecution against Paul and Barnabas, and expelled them out of their coasts.
Contradiction with 2 Corinthians 6:14
Advises not being yoked with unbelievers, which contradicts Acts 18:19 where Paul engages with those of different beliefs.
2 Corinthians 6:14: Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness?