I know that as Trinitarians, we believe that God exists as one God in three persons: God the Father, God the Son, and God the Holy Spirit.
That God the Father is God is patently obvious from the entire Old Testament.
That God the Son is God is made forcefully in John, Colossians, and throughout the New Testament.
We also know that Jesus sent the Holy Spirit, but...
Where in the Bible does it say that the Holy Spirit is God?