1 John 4:1-3

New Revised Standard Version, Anglicised Catholic Edition

Testing the Spirits

4 Beloved, do not believe every spirit, but test the spirits to see whether they are from God; for many false prophets have gone out into the world. ² By this you know the Spirit of God: every spirit that confesses that Jesus Christ has come in the flesh is from God, ³ and every spirit that does not confess Jesus^[a] is not from God. And this is the spirit of the antichrist, of which you have heard that it is coming; and now it is already in the world.