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,
    In a speech in Acts 20:29-31 toward the end of Paul’s third missionary journey (AD 56) he warned the Ephesian elders about the threat of false teachers. For this reason, Paul urges Timothy and the believers to hold on to sound doctrine (1 Timothy 1:10; 1 Timothy 6:3; 2 Timothy 1:13).