By calling this covenant “new,” he has made the first one obsolete; and what is obsolete and aging will soon disappear.
In today’s world things become obsolete faster and faster. Regardless whether we like it or not, it is a matter of fact. Even with God things become obsolete though.
When God gave us the New Covenant, it made the old covenant obsolete. It did not make the laws that God gave us beforehand worthless however. The laws that God gave Moses were for a reason and they are just as applicable today.
What became obsolete was the method of salvation in the Old Testament. Then a person was saved through the following of the law. Because no one could follow the law though, sacrifices were put in place to atone for the sins of the people.
With the New Covenant, Jesus is the once-for-all sacrifice. We are still unable to uphold the law and are in need of a sacrifice for our sins. But now Jesus has taken care of those sacrifices.
Just as the Old Testament sacrifices didn’t negate the need to obey God, neither does Jesus’ sacrifice do away with the law. We live in an era of grace but that grace should not be taken advantage of. As Paul writes, by no means should we sin so that grace may abound.