In 2 Samuel 23:2, the Holy Spirit is clearly Yahweh, as He Speaks as Yahweh in the first Person. There is no other way to understand what the Hebrew says here
“
The Spirit of the LORD speaks by me (heb., דִּבֶּר־בִּי, is masculine);
His word (heb., וּמִלָּתוֹ , is feminine, lit, “Her word”) is on my tongue. The God of Israel has spoken; the Rock of Israel has said to me”
We would have expected “אֶת־דְּבָרוֹ”, the masculine, “His word”, which would agree with “יהוה” (YHWH), which is masculine. The Spirit here is the subject, He is the One Who speaks by David, and it is His word that is on David’s tongue. The following words also belong to the Spirit, Who is also called “The God of Israel”, and “the Rock of Israel”. Very strong assertion for the Deity of the Holy Spirit.
In Acts chapter 5, the Holy Spirit is clearly called God
“But Peter said, “Ananias, why has Satan filled your heart to
lie to the Holy Spirit and to keep back for yourself part of the proceeds of the land? While it remained unsold, did it not remain your own? And after it was sold, was it not at your disposal? Why is it that you have contrived this deed in your heart? You have
not lied to man but to God…But Peter said to her, “How is it that you have agreed together to
test the Spirit of the Lord?…” (5:3, 4, 9)
The Apostle Peter says to Anania, that he lied to “The Holy Spirit (το πνευμα το αγιον)”. And then says, in doing so, he actually lied “to the God (τω θεω). And then tells his wife, Sapphira, that they had “tested the Spirit of the Lord”, by their actions.
Here we have the Deity of the Holy Spirit, where He is called “God”, and “the Spirit of the Lord”. Notice the definite article in the Greek, “τω”, with “God”, where it cannot be translated as “god”.
In Acts 13:2, we read, "As they served the Lord and fasted", and the Person Who responds, is the Holy Spirit, "the Holy Spirit said, “Separate Barnabas and Saul for me, for the work to which I have called them". Note, the Holy Spirit called Paul into the ministry!
See my lastest thread on the reading in the Dead Sea Scrolls, for Isaiah 40:13-14, which is also clear that the Holy Spirit is Yahweh,
Isaiah 40:13, the DSS and The Holy Spirit
The DSS are Jewish and from the end BC, and 1st century AD, so cannot have been corrupted by Christians
But again, this is all predicated on the assumption of a third person. Who called Paul to the ministry. It was Christ. So, If the Father is God, and Christ is God, and the Holy spirit is God, let me ask you the question that always sends these discussions into the realm of the absurd. Since you acknowledge the separate persons, how is there, and what is, the one God? If there's only one God, and each of the persons are God, and there are three persons, how is there one God? I don't really expect an answer to this question as there isn't one. It's logical contradiction, unless we're saying the word God is something other than a person. If it's a title, which I believe it is, then yes, there can be more than one and still be only one God. That's because we apply it to authority. However, that opposes your OP which claims that there are three that are coequal. This is why Trinitarianism gets trapped in a box. There's no realistic way out which is why no one can ever give a good explanation of the Trinity.
I think one of the problems is that people don't differentiate between the uses of the word God. In conflating them they wind up with confusing and illogical doctrines. That's the case with the Trinity doctrine. The Athanasian Creed, which states that there are three coequal, coeternal, persons, is what the majority hold to today. The problem is that doesn't fit with what we find in Scripture. For instance we find this.
And Jacob asked him, and said, Tell me, I pray thee, thy name. And he said, Wherefore is it that thou dost ask after my name? And he blessed him there. 30 And Jacob called the name of the place Peniel: for
I have seen God face to face, and my life is preserved.
The Holy Bible: King James Version, Electronic Edition of the 1900 Authorized Version. (Bellingham, WA: Logos Research Systems, Inc., 2009), Ge 32:29–30.
Though thou detain me, I will not eat of thy bread: and if thou wilt offer a burnt offering, thou must offer it unto the LORD. For Manoah knew not that he was an angel of the LORD. 17 And Manoah said unto the angel of the LORD, What is thy name, that when thy sayings come to pass we may do thee honour? 18 And the angel of the LORD said unto him, Why askest thou thus after my name, seeing it is secret? 19 So Manoah took a kid with a meat offering, and offered it upon a rock unto the LORD: and the angel did wondrously; and Manoah and his wife looked on. 20 For it came to pass, when the flame went up toward heaven from off the altar, that the angel of the LORD ascended in the flame of the altar. And Manoah and his wife looked on it, and fell on their faces to the ground. 21 But the angel of the LORD did no more appear to Manoah and to his wife. Then Manoah knew that he was an angel of the LORD. 22 And Manoah said unto his wife, We shall surely die,
because we have seen God
The Holy Bible: King James Version, Electronic Edition of the 1900 Authorized Version. (Bellingham, WA: Logos Research Systems, Inc., 2009), Jdg 13:16–22.
In these passages, Jacob, Manoah, and his wife, are all said to have seen God. Yet the apostle John says that no one has seen God. If we have three coequal, coeternal persons, we have contradiction. Either Jacob, and Manoah are wrong, or John is wrong. However, if John is using the word God as a name for the Father, then there is no problem. That's exactly what we find.
18
No man hath seen God at any time; the only begotten Son, which is in the bosom of the Father, he hath declared him.
The Holy Bible: King James Version, Electronic Edition of the 1900 Authorized Version. (Bellingham, WA: Logos Research Systems, Inc., 2009), Jn 1:18.
John tells us that man no has seen God at anytime. How can that be if people in the OT saw God? If John is referring specifically to the Father, there's no problem. This has to be the case because, people saw the preincarnate Christ. John says, the Son has made God known. So, in this passage John is contrasting the Son with God. Obviously, God in this instance does not refer to the Son. So, if Jesus is God and in this instance is differentiated from God, the word God must be being used in a different sense. We have Paul's words. He too tells us that no one has seen God.
14 That thou keep this commandment without spot, unrebukeable, until the appearing of our
Lord Jesus Christ: 15 Which in his times
he shall shew, who is the blessed and only Potentate, ythe King of kings, and Lord of lords; 16 Who only hath immortality, adwelling in the light which no man can approach unto; whom no man hath seen, nor can see: to whom be dhonour and power everlasting. Amen.
The Holy Bible: King James Version, Electronic Edition of the 1900 Authorized Version. (Bellingham, WA: Logos Research Systems, Inc., 2009), 1 Ti 6:14–16.
Paul tells us that not only has no man seen God, but that no one can see Him. Paul says this one who cannot be seen is the "Only" potentate, the King of Kings, and Lord of lords, who no one can see. That Can't be Jesus as many have seen Him. That only leaves the Father. If He's the only potentate, then He has authority above that of Christ, thus we don't have three coequals. Conflating these different usages of the word God is very problematic. Sometimes the word is used of deity and other times it is used to refer to a specific deity. Jesus is God in the sense that He is Deity. He is not God in the sense of the one True God.
Regarding speaking in the first person. We would expect to find this. Paul says that Jesus is the express image of the Father. Jesus Himself said that the words He spoke were not His but the Father's. If He's speaking for the Father, we would expect the use of the first person. Regarding the Spirit speaking in the first person, we would also expect that since the Spirit is the Father. It's not a third person. Jesus tells that us pretty clearly.
7 Nevertheless I tell you the truth. It is to your advantage that I go away; for if I do not go away,
the Helper will not come to you; but if I depart, I will send Him to you. 8 And when He has come, He will convict the world of sin, and of righteousness, and of judgment: 9 of sin, because they do not believe in Me; 10 of righteousness, because I go to My Father and you see Me no more; 11 of judgment, because the ruler of this world is judged.
12 “I still have many things to say to you, but you cannot bear them now. 13 However, when He,
the Spirit of truth, has come, He will guide you into all truth; for He will not speak on His own authority, but whatever He hears He will speak; and He will tell you things to come. 14 He will glorify Me, for He will take of what is Mine and declare it to you. 15 All things that the Father has are Mine. Therefore I said that He will take of Mine and declare it to you.
The New King James Version (Nashville: Thomas Nelson, 1982), Jn 16:7–15.
So here Jesus is speaking of the Helper and the Spirit of Truth. Correct me if I'm wrong, but I believe we would all agree that the Helper and the Spirit of Truth are the Holy Spirit. Jesus goes on to explain more. After telling them of HIs going away, He says this.
25 “These things I have spoken to you in
figurative language; but the time is coming when I will no longer speak to you in
figurative language, but
I will tell you plainly about the Father
The New King James Version (Nashville: Thomas Nelson, 1982), Jn 16:25.
Jesus said that in speaking of those things He was speaking in figurative language. What things were they? The Helper and the Spirit of Truth. He says they were figurative language about the Father. The Father is the Helper and Spirit of Truth. We know that the Greek and Hebrew words translated spirit literally mean wind and by extension breath. We know that the English word spirit is a figurative translation of these Greek and Hebrew words. That bags the question, what is the Holy Wind or Breath? Luke Equates it as "the power of the Highest" in his Gospel. In Genesis we see the Wind or Breath of God is that which gives man life. In Job we find that the Wind or Breath of God is what gives man understanding. Why is this Wind or Breath called the Holy Wind when given to believers? I would submit that it's because that when God called Israel to be His people, He told them were to be a Holy and separate people. Christians are likewise called to this same thing. Thus we are given this Wind or Breath to assist us in living holy.
The Scriptures simply don't allow for a third person. That is simply a misunderstanding of Scripture that was codified in the Athanasian Creed.