The Holy Spirit is the third person of the Trinity, after the Father and the Son. Note that He is a Person, not a force or liquid such as oil, or fire, wind or power - all these are only symbols used to describe him. There are people who refer to the Holy Spirit as "rushing wind" because when the Holy Spirit came at Pentecost, He was accompanied by the sound of a rushing wind. This is a little like addressing a person as "Van Heusen shirt" because he was wearing a Van Heusen shirt when you first met him.
In the Old Testament, the Trinity is not explicitly mentioned, but there are a few references to the Son and the Holy Spirit. For instance, the Spirit of Jehovah is mentioned as coming upon judges like Othniel, Samson, Gideon, etc (Jud 3:10, 6:34, 11:29, 13:25 and so on). David prays begging God not to take His Holy Spirit away from Him (Ps 51:11). In the New Testament, the Lord Jesus introduces the Holy Spirit as the Comforter who will be with the disciples after He's gone (John 14:16). Let us try to understand what the Holy Spirit is doing today.
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