'Cancel' in the Bible

What if some of the Jews were unfaithful? Their unfaithfulness cannot cancel God's faithfulness, can it?

Brothers, let me use an example from everyday life. Once an agreement has been ratified, no one can cancel it or add conditions to it.

This is what I mean: The Law that came 430 years later did not cancel the covenant that God ratified previously. The promise was never nullified.