So if anyone says to you, ‘Behold, he is in the wilderness,’ do not go out there. If they say, ‘Behold, he is in the inner rooms,’ do not believe it. For just as lightning comes from the east and is visible even in the west, so will the coming of the Son of Man be.
This is how you can recognize the Spirit of God: every spirit that acknowledges that Jesus Christ has come in the flesh is from God, and every spirit that does not acknowledge Jesus is not from God. This is the spirit of the Antichrist, about whose coming you have been told, and that it is already in the world.