God's former covenant with Israel was the 10 Commandments/the Law of Moses it was based on the Leviticsal priesthood (Heb 7:11). Jesus is now our covenant. His blood and His priesthood are the basis of our covenant with God (Isa 42:6; 49:8; Luke 22:20; 2 Cor 3:6; Jer 31:31; Heb 8:8).