/Confession/Section 18: This priesthood was not legal or temporary, but according to the order of Melchisedec, and is stable and perfect, not for a time, but forever, which is suitable to Jesus Christ, as to Him that ever liveth. Christ was the priest, sacrifice, and altar: He was a priest according to both natures; He was a sacrifice according to His human nature; whence in Scripture it is attributed to His body, to His blood: Yet the effectualness of this sacrifice did depend upon His divine nature; therefore it is called the blood of God. He was the altar according to His divine nature, it belonging to the altar to sanctify that which is offered upon it, and so it ought to be of greater dignity than the sacrifice itself.
Heb. 7:16, etc.; Heb. 5:6, 10:10; 1 Pet. 1:18-19; Col. 1:20, 22; Heb. 9:13; Acts 20:28; Heb. 9:14, 13:10, 12, 15; Matt. 23:17; John 17:19.