The Old Testament Scriptures

In the NT when scriptures are mentioned they are referring to the OT. Paul "powerfully refuted the Jews in public, showing by the Scriptures that the Christ was Jesus." Luke wrote that "a Jew named Apollos, a native of Alexandria, came to Ephesus. He was an eloquent man, competent in the Scriptures."

Do you suppose if Christians were competent in the Scriptures, the OT Scriptures, the church would be more evangelistic?