John 3:5 Jesus answered, Verily, verily, I say unto thee, Except a man be born of water and of the Spirit, he cannot enter into the kingdom of God.

1 John 5:8 And there are three that bear witness in earth, the spirit, and the water, and the blood: and these three agree in one.

The Blood: Colossians 1:14 In whom we have redemption through his blood, even the forgiveness of sins:

The Water: Acts 2:38 Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins,...

The Spirit: Acts 2:38 ...and ye shall receive the gift of the Holy Ghost.