1 John 5:8 WEB

⁶  This is he who came by water and blood, Jesus Christ; not with the water only, but with the water and the blood. It is the Spirit who testifies, because the Spirit is the truth.

⁷  For there are three who testify{Only a few recent manuscripts add 'in heaven: the Father, the Word, and the Holy Spirit; and these three are one. And there are three that testify on earth'}:

⁸  the Spirit, and the water, and the blood; and the three agree as one.

⁹  If we receive the witness of men, the witness of God is greater; for this is God's testimony which he has testified concerning his Son.

¹⁰  He who believes in the Son of God has the testimony in himself. He who doesn't believe God has made him a liar, because he has not believed in the testimony that God has given concerning his Son.