What is the biblical basis against the personhood of the Holy Spirit? Someone already asked a question seeking the biblical basis for the personhood of the Holy Spirit, but it seems that no one has asked a question yet seeking the opposite. Thus, in order to fill this gap, I ask:
What is the biblical basis against the personhood of the Holy Spirit?
The case against a Holy Spirit person or entity that IS NOT the Father is clearly outlined in scripture. IOW, the HS IS the Spirit of the Father according to the scriptures and not a separate entity of a 3 part God.
Basically, according to Jesus and the Apostles, he hardly even exists if all the verses speaking of the Father and His relationship with Jesus and us is concerned.
No one gives greetings or sends messages, or prays to the HS.
No instruction is given about 'him'.
No mandate for his place within the so-called 'Godhead'.
To understand otherwise is to read into the text that which is not plainly provided.
In Luke, Jesus rules out everyone - humans, spirits, devils from his statement - 'only the Father knows'. If there was a Holy Spirit entity he would have to be included in this intimate knowing.

All things have been handed over to Me by My Father, and no one knows who the Son is except the Father, and who the Father is except the Son, and anyone to whom the Son wills to reveal Him. Luke 10:22

Furthermore, the disciples have left us with their wisdom on this matter which shows us what the holy spirit is.

the Holy Spirit will teach you in that very hour what you ought to say Luke 12:12


For it is not you who speak, but the Spirit of your Father that speaks in you. Matt 10:20

We have many examples of 'the spirit of...' Christ, truth, grace, wisdom, Zerubbabel, Father, etc. None of these is a 'separate' entity. God gives name to everything and everyone - even changing names to suit new circumstances or roles. The HS has no name. Just as the 'spirit of Christ' or 'wisdom' has no special name either as it is the essence of who they are.
Let's not be misled by the 'him' and 'he' liberally applied by our interpretive translators, where 'which' and 'it' could/should have been applied.
If there is a Holy Spirit entity, Jesus or the apostles never taught this. It wasn’t included in the creeds until centuries after the church started, further confirming that it wasn’t a teaching of the apostles.
While we can certainly read this aspect of God into our theology from a few select verses, what would be the point if it is not a truth God has clearly provided for Jesus’ followers?
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Lots of times Isaiah 63 gets quoted, 'and they grieved His Holy Spirit'
Perfect example of proof-texting! We could equally say, based on what the apostles have told us, (the Holy Spirit IS the spirit of the Father) He was grieved in His heart! How one justifies a 'person' from this verse is astounding!
Read on same verse.

Therefore He turned Himself to become their enemy, He fought against them.

Who is HE? Not the HS, but God - He fought, He became their enemy. His Spirit was grieved.
The biblical basis against the 'person' of HS is abundant. Anything suggesting otherwise is based on very poor exegesis like the Isaiah 63 proof-texting approach, ignoring context and drawing faulty presumptions.
In short, the biblical basis against a Holy Spirit 'person' is

to read what is provided.
to not draw poor conclusions from a text in isolation.
to not add to the text that which it does not naturally supply.

Excerpt from Why Doesn't the Holy Spirit know who Jesus is?