Matthew Poole and continuators on Hebrews 9:20

20 Saying, This is the blood of the testament, which God hath enjoined unto you .

Moses after his sprinkling the Altar, Book of the Covenant, and all Israel, taught them the meaning of it; saying, This that is the Blood wherewith I have sprinkled you, is a Sign or Seal of the Testament, the Blood by which it is ratified and confirmed: The Blood typified and represented by it, was that of Christ the Testator, by which all the New Testament is ratified to all penitent, believing Sinners that look to it, without which it could never have been made good. The Blood of Christ is the immovable, foundation of this Testament, Exod. 24.8. compare 1 Cor. 11.25. Even the Testamental Covenant which Iehovah had made with them, and which he enjoined them, by such a rite as this to ratifie and confirm.

Marginal references: Exod. 24.8. Mat. 26.28.