Chadash is usually translated new, and the English misleads. The root ch-d-sh is the same root that gives us chodesh, the new moon, which is new every single month and yet the same moon every single month. The word carries renewal far more than novelty: not a thing scrapped and replaced by an unrelated thing, but a thing made fresh again, restored, renewed.

This is the word under the brit chadashah, the new covenant Yirmeyahu (Jeremiah) promised (Jeremiah 31:31). Hear it as the prophet's own grammar names it: the very next verse describes the renewal as Torah relocated, written on the heart rather than removed from the people. The covenant is renewed, not replaced. The mercies that are new every morning (Lamentations 3:23) are chadash in exactly this sense, the same faithful God renewing His covenant love with each sunrise.