What Does “Holy Spirit” Mean in the Bible?
He is God, just like the Father and the Son: the third Person of the Most Holy Trinity. In the Creed we say that he is “the Lord, the giver of life.”
Where it appears in the Bible
Mark 1:8; Luke 1:41
What the Bible says
Mark 1:8
I have baptized you with water; but he shall baptize you with the Holy Ghost.
Luke 1:41
And it came to pass, that when Elizabeth heard the salutation of Mary, the infant leaped in her womb. And Elizabeth was filled with the Holy Ghost:
Douay-Rheims Bible (Challoner revision), public domain.
Source: Catechism 245 and 685