1 John 4:2-6

2By this you know the Spirit of God: Every spirit that confesses that Jesus Christ has come in the flesh is of God,

3and every spirit that does not confess that Jesus Christ has come in the flesh is not of God. And this is the spirit of the Antichrist, which you have heard was coming, and is now already in the world.

4You are of God, little children, and have overcome them, because He who is in you is greater than he who is in the world.

5They are of the world. Therefore they speak as of the world, and the world hears them.

6We are of God. He who knows God hears us; he who is not of God does not hear us. By this we know the spirit of truth and the spirit of error.