1 John 5:7-11

7For there are three that bear witness in heaven: the Father, the Word, and the Holy Spirit; and these three are one.

8And there are three that bear witness on earth: the Spirit, the water, and the blood; and these three agree as one.

9If we receive the witness of men, the witness of God is greater; for this is the witness of God which He has testified of His Son.

10He who believes in the Son of God has the witness in himself; he who does not believe God has made Him a liar, because he has not believed the testimony that God has given of His Son.

11And this is the testimony: that God has given us eternal life, and this life is in His Son.