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,

 There are the murderers (androphonoi, G409) , literally man-slayers. Paul is thinking of the Ten Commandments and of how breach after breach of them characterizes the heathen world. We must not think that this at least has nothing to do with us, for Jesus widened the commandment to include not only the act of murder, but also the feeling of anger against a brother. 