When the meeting of the synagogue broke up, many Jews and devout converts to Judaism followed Paul and Barnabas, who spoke to them and urged them to continue in the grace of God. The next sabbath almost the whole city gathered to hear the word of the Lord. Acts 13:43-44
Paul is invited to return to speak in the synagogue the next sabbath. Although there is opposition and they will soon be publicly mocked/challenged both will stay true to the faith. Their responses are to explain their call from God to come, to offer Christ in words and deeds, and to form city Church.
Paul and Barnabas find that there is a larger section of persons in the city who hunger for salvation, love the word of God, and openly receive Christ. The activity of the Holy Spirit’s heart-warming and transforming entrance into believers is absolutely marvelous. Paul and Barnabas are urged to ‘continue in grace’ and they do.
Almost the whole city gather to hear the word of the Lord. Faith comes by hearing and hearing by the word of God, which Paul is speaking. These city people came out in droves because they were curious? I doubt it. They came to listen to Paul because the Holy Spirit stirred their hearts and they could do no others then to listen with their hearts. The King of Kings met them.