Here's a verse with all three persons of the Godhead, show that the Holy Spirit is eternal. Hebrews 9:14"how much more shall the blood of Christ, who through the eternal Spirit offered Himself without spot to God, cleanse your conscience from dead works to serve the living God?"
Hebrews shows the diety of Christ in chapter one and the diety of the Holy Spirit in chapters 3, 10.
Hebrews 3:7-11 “Therefore, as the Holy Spirit says: “Today, if you will hear His voice,8 do not harden your hearts as in the rebellion, in the day of trial in the wilderness,9 where your fathers tested Me, tried Me, and saw My works forty years.10 Therefore I was angry with that generation, and said, ‘They always go astray in their heart, and they have not known My ways.’11 So I swore in My wrath,‘they shall not enter My rest.’”
Hebrews attributes this to the Holy Spirit and Psalm 95:7-11 attributes it to the Lord, Psalm 95:1, 7-11.
“Oh come, let us sing to the Lord;let us make a joyful noise to the rock of our salvation!....7For he is our God,and we are the people of his pasture,and the sheep of his hand. Today, if you hear his voice,8do not harden your hearts, as at Meribah,as on the day at Massah in the wilderness,9 when your fathers put me to the testand put me to the proof, though they had seen my work.10 For forty years I loathed that generationand said, “They are a people who go astray in their heart,and they have not known my ways.”11 Therefore I swore in my wrath, “They shall not enter my rest.”
Hebrews 10:15-17 “But the Holy Spirit also witnesses to us; for after He had said before,16 “This is the covenant that I will make with them after those days, says the Lord: I will put My laws into their hearts, and in their minds I will write them,”17 then He adds, “Their sins and their lawless deeds I will remember no more.”
Jeremiah 31:31, 33-34 “Behold, the days are coming, declares the Lord,….33 For this is the covenant that I will make with the house of Israel after those days, declares the Lord: I will put my law within them, and I will write it on their hearts. And I will be their God, and they shall be my people.34 And no longer shall each one teach his neighbor and each his brother, saying, ‘Know the Lord,’ for they shall all know me, from the least of them to the greatest, declares the Lord. For I will forgive their iniquity, and I will remember their sin no more.”
Hebrews attributes these to the Holy Spirit with Psalms and Jeremiah attributes these to the Lord, showing the Holy Spirit's diety and that He is the Lord God.