Christ came in the volume of the Book; Psalms 40:7 and Paul made it one and the same as the 'New' Hebrews 10:7.
Psalms 40:7 Then said I, "Lo, I come: In the volume of the book it is written of me.
Man can add or erase whatever they may, will not change the outcome it is Written.
Shall I saw New Testament principles? We instilled the law aspects of the book, not the grace.