Hebrews 10:15

Verses 15-17. Whereof the Holy Ghost is a witness to us. That is, the Holy Ghost is a proof of the truth of the position here laid down --that the one atonement made by the Redeemer lays the foundation for the eternal perfection of all who are sanctified. The witness of the Holy Ghost here referred to is that which is furnished in the Scriptures, and not any witness in ourselves. Paul immediately makes his appeal to a passage of the Old Testament, and he thus shows his firm conviction that the Scriptures were inspired by the Holy Ghost. For after that he had said before. The apostle here appeals to a passage which he had before quoted, Jer 31:33,34.