Not a who but a what.
What? Holy spirit. Spirit that is holy. pneuma hagion
Holy spirit was sent. No definate article in the Greek. The definate article "the" was added in translation to substantiate faulty theology.
Don't believe me? just look at any interlinear or concordance.
Are you trying to say that there is more than one "Holy Spirit"?
5:6 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.
5:7 For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one.