1 John 4:1–3
4 Dear friends, do not believe every spirit, but test the spiritsh to see if they are from God, because many false prophets have gone out into the world.
2 This is how you know the Spirit of God: Every spirit that confesses that Jesus Christ has come in the fleshi is from God,j 3 but every spirit that does not confess JesusA is not from God. This is the spirit of the antichrist,k which you have heard is coming; even now it is already in the world.
Other mss read confess that Jesus has come in the flesh