Acts 18:4

18:4 He addressed both Jews and Greeks in the synagogue every Sabbath, attempting to persuade them.

Acts 17:2

17:2 Paul went to the Jews in the synagogue, as he customarily did, and on three Sabbath days he addressed them from the scriptures,

Acts 18:19

18:19 When they reached Ephesus, Paul left Priscilla and Aquila behind there, but he himself went into the synagogue and addressed the Jews.