Hebrews 10:15-17

So I always thought Jeremiah 31 when the LORD speaks of a new covenant that Jeremiah is referring to The Father or Jesus speaking as the LORD. According to Hebrews10:15-17, it’s the Holy Spirit who is talking about Jesus. Interesting. So that’s one of many verses in the New Testament that indicates the Holy Spirit's Godhood. The book of Hebrews has always interested me, curious as to who the author is, to which I really think is Paul considering Paul's life previous to seeing Jesus, being a Pharisee. Though, this isn't exactly a good answer as there were many Pharisees who converted during Paul's time, it just seems more fitting.