Our LORD Jesus confirmed the existing Abrahamic Covenant. He not only confirmed it with the many (Israel) but He strengthened it - improved it - made it new to include all of mankind. Reading the article in the link below, with all of it's Bible references, will confirm this truth. Our LORD Jesus IS the Ark of the (new and strengthened) Covenant. Hallelujah.

 

What Is the New Covenant in Jesus Christ? Bible Verses and Meaning (christianity.com)