28 For he vigorously refuted his Jewish opponents in public debate, proving from the Scriptures that Jesus was the Messiah.

Read Acts 18:28 Using Other Translations

For he mightily convinced the Jews, and that publickly, shewing by the scriptures that Jesus was Christ.
for he powerfully refuted the Jews in public, showing by the Scriptures that the Christ was Jesus.
He refuted the Jews with powerful arguments in public debate. Using the Scriptures, he explained to them that Jesus was the Messiah.