1 John 4:1-3

American Standard Version

4 Beloved, believe not every spirit, but prove the spirits, whether they are of God; because many false prophets are gone out into the world. ² Hereby know ye the Spirit of God: every spirit that confesseth that Jesus Christ is come in the flesh is of God: ³ and every spirit that ^[a]confesseth not Jesus is not of God: and this is the spirit of the antichrist, whereof ye have heard that it cometh; and now it is in the world already.