The Holy Ghost is Jehovah

1Jn 5:7  For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one.

The Father, the Word, and the Holy Ghost are three distinct entities or persons, not merely three aspects or offices of God.

The same person can’t bear witness as a holder of different offices and have all of the testimonies counted as different testimonies.

Jesus proved to the Pharisees that He and the Father were two different persons.

Joh 8:13  The Pharisees therefore said unto him, Thou bearest record of thyself; thy record is not true.

Joh 8:14  Jesus answered and said unto them, Though I bear record of myself, yet my record is true: for I know whence I came, and whither I go; but ye cannot tell whence I come, and whither I go.

Joh 8:15  Ye judge after the flesh; I judge no man.

Joh 8:16  And yet if I judge, my judgment is true: for I am not alone, but I and the Father that sent me.

Joh 8:17  It is also written in your law, that the testimony of two men is true.

Joh 8:18  I am one that bear witness of myself, and the Father that sent me beareth witness of me.

Though Jesus and the Father were two different persons, they are one God.

Joh 10:30  I and my Father are one.

Joh 10:31  Then the Jews took up stones again to stone him.

Joh 10:32  Jesus answered them, Many good works have I shewed you from my Father; for which of those works do ye stone me?

Joh 10:33  The Jews answered him, saying, For a good work we stone thee not; but for blasphemy; and because that thou, being a man, makest thyself God.

So it is with the Holy Ghost with the Father and Jesus Christ, the three are one God who all bear record that Jesus is the Son of God (1Jo 5:7).

The Holy Ghost is elsewhere declared to be God.

Act 5:3  But Peter said, Ananias, why hath Satan filled thine heart to lie to the Holy Ghost, and to keep back part of the price of the land?

Act 5:4  Whiles it remained, was it not thine own? and after it was sold, was it not in thine own power? why hast thou conceived this thing in thine heart? thou hast not lied unto men, but unto God.

The Holy Ghost is Jehovah

Heb 3:7  Wherefore (as the Holy Ghost saith, To day if ye will hear his voice,

Heb 3:8  Harden not your hearts, as in the provocation, in the day of temptation in the wilderness:

Heb 3:9  When your fathers tempted me, proved me, and saw my works forty years.

Heb 3:10  Wherefore I was grieved with that generation, and said, They do alway err in their heart; and they have not known my ways.

Heb 3:11  So I sware in my wrath, They shall not enter into my rest.)

c/w

Psa 95:6  O come, let us worship and bow down: let us kneel before the LORD our maker.

Psa 95:7  For he is our God; and we are the people of his pasture, and the sheep of his hand. To day if ye will hear his voice,

Psa 95:8  Harden not your heart, as in the provocation, and as in the day of temptation in the wilderness:

Psa 95:9  When your fathers tempted me, proved me, and saw my work.

Psa 95:10  Forty years long was I grieved with this generation, and said, It is a people that do err in their heart, and they have not known my ways:

Psa 95:11  Unto whom I sware in my wrath that they should not enter into my rest.

And again….

Heb 10:15  Whereof the Holy Ghost also is a witness to us: for after that he had said before,

Heb 10:16  This is the covenant that I will make with them after those days, saith the Lord, I will put my laws into their hearts, and in their minds will I write them;

Heb 10:17  And their sins and iniquities will I remember no more.

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Jer 31:33  But this shall be the covenant that I will make with the house of Israel; After those days, saith the LORD, I will put my law in their inward parts, and write it in their hearts; and will be their God, and they shall be my people.

Jer 31:34  And they shall teach no more every man his neighbour, and every man his brother, saying, Know the LORD: for they shall all know me, from the least of them unto the greatest of them, saith the LORD: for I will forgive their iniquity, and I will remember their sin no more.