I agree. I was just not sure how you were using it. As I am sure you are aware, there are segments in the church who separate the baptism and indwelling of the Holy Spirit.
Right. I'll try to connect those dots with this post. We need to start building.
It was not available to all covenant people before Pentecost. David clearly had the Holy Spirit. At one point he asked God to not take the Holy Spirit from him. There were many OT saints, even before the Mosaic Covenant was given. Abraham is a prime example and directly relates to this, and through covenant. There was one covenant made with Abraham, with two distinct parts. One for his descendants for the land and God being their God in covenant relationship. The one true and living God, speaking, acting etc. within history, as contrasted to all the deaf and dumb and powerless gods of all the surrounding nations.
Yes, David had the Holy Spirit. There is a work by the Holy Spirit in the OT. But it's short of what the NT indwelling gives.
So it cannot be said that God never baptised anyone with the Holy Spirit, resulting in regeneration, prior to Pentecost. He likely did so since salvation has always been by faith, and never by law. And we know that the faith necessary to believe God, and therefore trust, love, and obey him, is not something the fallen human race possesses within themselves, but it must be given to them by God. We know that spiritual things cannot be discerned without the Holy Spirit.
Nobody was in Christ before Pentecost. That's why we call it the birth of the Church. So there was no baptism yet. The agent of that baptism was prophesied to be given, but was not given until Pentecost. This is why the OT saints were kept in Shoel, Abrahams bosom. The legality of their salvation needed to be satisfied, that being, the righteous/sinless life of incarnate Jesus and His death on the cross. Think of it this way, it was owed to them (they had faith), it was degreed for the elect, but God's Holiness/Justice doesn't accept righteous credit, or atonement credit, it had to actually happen before any believer could be in His presence. This is why OT saint had to wait in Shoel/Hades. It's like a holding cell (captivity captive). They were not born again (John 3:5,13), nor could they be, because there was not yet a death and resurrection so that they could die and be raised up in. And the means of us becoming in Christ, the Holy Spirit baptism, was not yet available. Even in the Ez. passage that you gave, it spoke about this as a future event. If they already had this "Promise of the Father", it would not be a future event. Jesus, even up to His last moments before His death on the cross, spoke about the coming of the Holy Spirit and the "promise" (EZ passage) of the Father that was about to be given.
I think it would be best if we started out with being born again. What are the spiritual mechanics of being born again? How does it happen. I know you probably get all this, but please bear with me. We need to build this through scripture.
I'll post four passages that are critical and foundational to understanding everything here. But first, I want to talk about the resurrection. All through out scripture we are told that we are saved through the resurrection of Jesus. That we are raised up with Him. We see this everywhere in the NT. I'll post a few just to get started.
1 Peter 1:3
Blessed be the God and Father of our Lord Jesus Christ, who according to His abundant mercy has begotten us again to a living hope through the resurrection of Jesus Christ from the dead,
My personal favorite. Eph 2:1-10ish. What I like the most is that the first part speaks of spiritual death, and the second part speaks of the spiritual life. Both of these are separated by a simple statement that can easily be overlooked. I'll highlight it.
And you He made alive, who were dead in trespasses and sins, in which you once walked according to the course of this world, according to the prince of the power of the air, the spirit who now works in the sons of disobedience, among whom also we all once conducted ourselves in the lusts of our flesh, fulfilling the desires of the flesh and of the mind, and were by nature children of wrath, just as the others. But God, who is rich in mercy, because of His great love with which He loved us, even when we were dead in trespasses, made us alive together with Christ (by grace you have been saved), and raised us up together, and made us sit together in the heavenly places in Christ Jesus, that in the ages to come He might show the exceeding riches of His grace in His kindness toward us in Christ Jesus. For by grace you have been saved through faith, and that not of yourselves; it is the gift of God, not of works, lest anyone should boast.
I'm sure that you can probably think of many more passages like this off of the top of your head. Now, what is important to realize is that being raised up with Him IS synonymous with being born again. They mean the same thing. Now to the four passages that speak of the baptism with the Holy Spirit. These are all post Pentecost and past the transition period from the OC to the NC, so these passages are the norm for today. Each further defines the other. These are extremely important so ponder on them for a while if you like.
1 Peter 3:21
There is also an antitype which now saves us--baptism (not the removal of the filth of the flesh, but the answer of a good conscience toward God), through the resurrection of Jesus Christ,
Galatians 3:26-29
For you are all sons of God through faith in Christ Jesus. For as many of you as were baptized into Christ have put on Christ. There is neither Jew nor Greek, there is neither slave nor free, there is neither male nor female; for you are all one in Christ Jesus. And if you are Christ's, then you are Abraham's seed, and heirs according to the promise.
Colossians 2:10
and you are complete in Him, who is the head of all principality and power. In Him you were also circumcised with the circumcision made without hands, by putting off the body of the sins of the flesh, by the circumcision of Christ, buried with Him in baptism, in which you also were raised with Him through faith in the working of God, who raised Him from the dead. And you, being dead in your trespasses and the uncircumcision of your flesh, He has made alive together with Him, having forgiven you all trespasses, having wiped out the handwriting of requirements that was against us, which was contrary to us. And He has taken it out of the way, having nailed it to the cross.
Romans 6:3-10
Or do you not know that as many of us as were baptized into Christ Jesus were baptized into His death? Therefore we were buried with Him through baptism into death, that just as Christ was raised from the dead by the glory of the Father, even so we also should walk in newness of life. For if we have been united together in the likeness of His death, certainly we also shall be in the likeness of His resurrection, knowing this, that our old man was crucified with Him, that the body of sin might be done away with, that we should no longer be slaves of sin. For he who has died has been freed from sin. Now if we died with Christ, we believe that we shall also live with Him, knowing that Christ, having been raised from the dead, dies no more. Death no longer has dominion over Him. For the death that He died, He died to sin once for all; but the life that He lives, He lives to God.
What do we get from this? It is a spiritual baptism. It's a baptism initiated by faith (I know, don't get too deep here.

). A baptism by Jesus with the Holy Spirit. And it places us into/immerses us with/baptizes us in Christ. It makes us one with Him, just as He is one with the Father. At this point, we are now in Christ, in the Church, a Spiritual Body. One of the benefits of that spiritual union is we are born again. We die spiritually, and are
raised up with Him. Saved through the resurrection of Jesus Christ. In the Colossians passage it says that being born again (spiritual circumcision) is done as a result of being "in Him", and is not the cause of us being in Him. These passages reveal a lot if you look closely. All speak of the resurrection saving us. Galatians says the baptism is a baptism through faith, etc. And we know that being born again is the result of this union, not the cause.
The legality is also satisfied as a result of this spiritual union. Without this spiritual union, we are still under God's wrath. With it, we are legally right with God in every way. So the baptism is necessary for salvation. But the baptism has no power to give us this life until there is an actual death and resurrection by Jesus. Until the righteousness of God, Jesus, in His incarnation, as a man, obeyed the Law perfectly. The righteousness of God that is imputed to us doesn't exist to be imputed. The sinlessness that qualifies Him to atone for our sin, and then atonement needs to happen. All of this had to happen first before being placed into immersed into baptized into Christ had anything to give us for salvation. The main point being, without the baptism, and the ingredients, we cannot be saved. Salvation can be promised, as it was with the OT saints, but it had to actually happen for us to actually be made right with God.
Which brings us to the transition from OT to NT. Many things were said about this coming of the Holy Spirit. The Promise of the Father. All of these promises, through the Promise, even OT saints dead, kept in Hades, and OT saints still living in faith, were due the Promises. They all had to wait for the death, resurrection, and ascension of Jesus for the ingredients to be fulfilled. Then, the Holy Spirit, the Promise of the Father, the Agent of that baptism that saves us, could be given to given to every believer who was owed the Promise and promises. God did this first with the Jew, then with the Gentile. After everyone who believed Jesus and put their faith in Him before His death, resurrection, and ascension was given the Promise that they were owed (Holy Spirit baptism), then every believer from that point on received the baptism with the Holy Spirit by Jesus the moment that they first believe.
Dave