Hebrews 8:13 In speaking of a new covenant, he makes the first one obsolete. And what is becoming obsolete and growing old is ready to vanish away.
The old Mosaic covenant was a legal conditional covenant made with the physical nation of Israel only. It has been replaced with the new covenant, which is an unconditional gracious covenant made with believers from Israel plus every nation, tongue, and tribe on earth. The gospel of grace, which was preached to Abraham [Galatians 3:8], has been fulfilled by Jesus who is the mediator and guarantor of a more excellent and permanent covenant.
Focus on Christ #25