Passage cross-references.

But when the Comforter is come, whom I will send unto you from the Father, even the Spirit of truth, which proceedeth from the Father, he shall testify of me:

This is he that came by water and blood, even Jesus Christ; not by water only, but by water and blood. And it is the Spirit that beareth witness, because the Spirit is truth. …

The like figure whereunto even baptism doth also now save us (not the putting away of the filth of the flesh, but the answer of a good conscience toward God,) by the resurrection of Jesus Christ:

And suddenly there came a sound from heaven as of a rushing mighty wind, and it filled all the house where they were sitting. …

For many bare false witness against him, but their witness agreed not together.

The Spirit itself beareth witness with our spirit, that we are the children of God:

And as they were eating, Jesus took bread, and blessed it, and brake it, and gave it to the disciples, and said, Take, eat; this is my body. …

Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost:

And to this agree the words of the prophets; as it is written,

Who hath also sealed us, and given the earnest of the Spirit in our hearts.

For it is impossible for those who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the Holy Ghost,

Wherefore Jesus also, that he might sanctify the people with his own blood, suffered without the gate.