Hebrews 10:15 - Matthew Poole's English Annotations on the Holy Bible

The assumption cleared before, the apostle now proceedeth to prove out of the Old Testament, viz. that God's purpose was, by Christ's one sacrifice to take away all sins for ever; therefore there was no need of the repetition of the legal sacrifices. Whereof the Holy Ghost also is a witness to us: the authority avouched, is the testimony of the Holy Spirit of truth, that cannot deceive nor be deceived in what it witnesseth, but confirms the truth beyond all just ground of doubting, by his amanuensis the prophet Jeremiah, Jeremiah 31:31,33,34; where the person that the prophet styleth Jehovah, is by the apostle declared to be the Holy Ghost; and by it is proved to be the eternal God. He testifieth to us, the church of God, in the prophet's time, and to us all called to be members of it to this day. For after that he had said before: this contains the preface of the Spirit's testimony, that which he spake before, the covenant, which is his evidence; and this preface is laid down, Jeremiah 31:31. Here they are all the apostle's words.