1 John 4:1-4
Testing the Spirits
4:1 Dear friends, do not believe every spirit, but test the spirits to determine if they are from God, because many false prophets have gone out into the world.
4:2 By this you know the Spirit of God: Every spirit that confesses Jesus as the Christ who has come in the flesh is from God,
4:3 but every spirit that does not confess Jesus is not from God, and this is the spirit of the antichrist, which you have heard is coming, and now is already in the world.
4:4 You are from God, little children, and have conquered them, because the one who is in you is greater than the one who is in the world.