That which we have seen and heard declare we unto you, that you also may have fellowship with us: and truly our fellowship is with the Father, and with his Son Jesus Christ.

But if we walk in the light, as he is in the light, we have fellowship one with another, and the blood of Jesus Christ his Son cleanses us from all sin.

My little children, these things write I unto you, that you sin not. And if any man sin, we have an advocate with the Father, Jesus Christ the righteous:

Who is a liar but he that denies that Jesus is the Christ? He is antichrist, that denies the Father and the Son.

And this is his commandment, That we should believe on the name of his Son Jesus Christ, and love one another, as he gave us commandment.

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

And every spirit that confesses not that Jesus Christ is come in the flesh is not of God: and this is that spirit of antichrist, of which you have heard that it should come; and even now already is it in the world.

Whosoever shall confess that Jesus is the Son of God, God dwells in him, and he in God.

Whosoever believes that Jesus is the Christ is born of God: and everyone that loves him that begat loves him also that is begotten of him.

Who is he that overcomes the world, but he that believes that Jesus is the Son of God?

This is he that came by water and blood, even Jesus Christ; not by water only, but by water and blood. And it is the Spirit that bears witness, because the Spirit is truth.

And we know that the Son of God is come, and has given us an understanding, that we may know him that is true, and we are in him that is true, even in his Son Jesus Christ. This is the true God, and eternal life.