1 John 4:2-3 NIV

2 This is how you can recognize the Spirit of God: Every spirit that acknowledges that Jesus Christ has come in the flesh1 is from God,2

References for 1 John 4:2

3 but every spirit that does not acknowledge Jesus is not from God. This is the spirit of the antichrist,3 which you have heard is coming and even now is already in the world.4

References for 1 John 4:3