The New Covenant doesn’t “reaffirm” the Old… it makes it obsolete (Heb. 8:13). 

The Law was a shadow of what was to come (Col. 2:16-17), but Christ is the fulfillment. The true promise was to Abraham’s Seed (Gal. 3:16), not a legal system. Christ didn’t extend the Old Covenant

He replaced it (Luke 22:20, Heb. 8:6-13)