1st John 5:8

5 Who is able to overcome the world but the man who has faith that Jesus is the Son of God?

6 This is he who came by water and by blood, Jesus Christ; not by water only but by water and by blood.

7 And the Spirit is the witness, because the Spirit is true.

8 There are three witnesses, the Spirit, the water, and the blood: and all three are in agreement.

9 If we take the witness of men to be true, the witness of God is greater: because this is the witness which God has given about his Son.

10 He who has faith in the Son of God has the witness in himself: he who has not faith in God makes him false, because he has not faith in the witness which God has given about his Son.

11 And his witness is this, that God has given us eternal life, and this life is in his Son.