Notice that the question is who, rather than what, is the Holy Spirit. Our God is one God. This was the rallying cry of ancient Israel among the idolatrous peoples around them. "Hear, O Israel: Jehovah our God is one Jehovah" (Deut. 6: 4 ) . Yet somehow this One is a triunity-God the Father, God the Son, and God the Holy Spirit. "For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one" (1 Jno. 6:7). The Word was made flesh and dwelt among men-the Son of God ( John 1:1-5 ) .