For many cheats come into the world, they not acknowledging Jesus Christ coming in the flesh. This is the cheat and antichrist.

If there come any to you, and bring not this teaching, receive ye him not into the household, and to rejoice tell him not:

Having many things to write to you, I was not willing by paper and ink: but I hope to come to you, and to speak mouth to month, that our joy might be filled up.