1 John 4:1-2 NIV

On Denying the Incarnation

1 Dear friends, do not believe every spirit, but test the spirits to see whether they are from God, because many false prophets have gone out into the world.

References for 1 John 4:1

2 This is how you can recognize the Spirit of God: Every spirit that acknowledges that Jesus Christ has come in the flesh is from God,

References for 1 John 4:2