Whereof the Holy Ghost also is a witness to us: for after that he had said before, The Holy Ghost - is a witness to us - The words are quoted from Jeremiah 31:33, Jeremiah 31:34, and here we are assured that Jeremiah spoke by the inspiration of the Spirit of God. Had said before - See Hebrews 8:10, Hebrews 8:12, and the notes there.
Related Commentaries of Hebrews 10:15
Hebrews 10:15
15 Whereof the Holy Ghost also is a witness to us: for after that he had said before,