the Spirit, and the water, and the blood; and the three agree in one.
References for 1 John 5:8
If we receive the witness of men, the witness of God is greater. For this is the witness of God [which] he has witnessed concerning his Son.
He that believes on the Son of God has the witness in himself; he that does not believe God has made him a liar, because he has not believed in the witness which God has witnessed concerning his Son.
References for 1 John 5:10
And this is the witness, that God has given to us eternal life; and this life is in his Son.
He that has the Son has life: he that has not the Son of God has not life.
These things have I written to you that ye may know that ye have eternal life who believe on the name of the Son of God.
References for 1 John 5:13
And this is the boldness which we have towards him, that if we ask him anything according to his will he hears us.
And if we know that he hears us, whatsoever we ask, we know that we have the petitions which we have asked of him.
If any one see his brother sinning a sin not unto death, he shall ask, and he shall give him life, for those that do not sin unto death. There is a sin to death: I do not say of that that he should make a request.
Every unrighteousness is sin; and there is a sin not to death.
We know that every one begotten of God does not sin, but he that has been begotten of God keeps himself, and the wicked [one] does not touch him.
References for 1 John 5:18