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Go one verse back and Jesus mentions "Law and the Prophets" so Old Testament. Not all prophecies have been fulfilled as of now and even Law is supposed to be a shadow of future world so a prophecy - like Sabbath and reign of Christ 1000 years like a day.

Then death remains in the world. The Law still gives power to death. It still serves as a basis for accusation; Satan can still ask "has it not been written?". Everything of the old world will perish, Law included. And you are already dead, but you are children of a new world born again in Christ Jesus. You are heirs of this new world already through faith and as heirs you are under the Law of new world - the Law of Love taught by Jesus. None shall harm nor destroy in God's holy mountain. Stoning a rebellious son shall not be suffered to pass then and so it's not for you either.