As I exhorted you to stay at Ephesus when I was going into Macedonia, that you might charge certain men not to teach a different doctrine,
Ephesus -- A harbor city located in Asia Minor (modern Turkey). Ephesus was one of the largest cities in the Roman Empire. Paul went to Ephesus on his second missionary journey (Acts 19:1) and spent three years there @ AD 52-54) teaching in the school of Tyrannus and enabling Jews and Greeks throughout Asia to hear the word. 