The subject of the "Holy Spirit", third person of the Trinity, as presented in the Holy Scriptures, is one of those topics that both in past centuries as well as up to now in the twenty-first century, has been the object of bitter and long contention, for the simple reason that not everyone believes and accepts the doctrine of His "personality"; since for some He is nothing other than the "active force of God" and not a real person distinct from God the Father. Therefore, knowing what the Bible has to say to us about the Holy Spirit is very important, not only to learn what the Holy Scriptures have to say in this regard, but also to know how they present Him and with what characteristics they define Him.Having an overview of the many passages that speak about the Holy Spirit in the Bible will primarily serve, not only to provide clarity, but also to objectively evaluate what the writers of the Old and New Testaments intended to tell us about the Spirit of God. In fact, the Bible presents Him, in several passages as; "The Holy Spirit", "the Spirit of God" and "the Spirit of the Lord".It is also important to know the grammatical form that the Holy Scriptures use when referring to the Holy Spirit, which will undoubtedly help us to understand His functions and various activities. Here are the grammatical forms that the writers of the Old and New Testaments have used