1 John 4:1 WBT

¹  Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets have gone out into the world.

²  By this ye know the Spirit of God: Every spirit that confesseth that Jesus Christ hath come in the flesh, is from God:

³  And every spirit that confesseth not that Jesus Christ is come in the flesh, is not from God. And this is that [spirit] of antichrist, of which ye have heard that it should come; and even now already it is in the world.