1 John 4:3 Updated American Standard Version (UASV) 3 and every spirit that does not confess Jesus is not from God; this is the spirit of the antichrist,[11] of which you have heard that it is coming, and now it is in the world already.

We must not believe every spirit, for only the spirit that acknowledges that Jesus Christ has come in the flesh is from God; the one that fails to make this acknowledgment is the spirit of the Antichrist.