15Brothers and sisters, I give an example from daily life: once a person’s will has been ratified, no one adds to it or annuls it. 16Now the promises were made to Abraham and to his offspring; it does not say, “And to offsprings,” as of many; but it says, “And to your offspring,” that is, to one person, who is Christ. 17My point is this: the law, which came four hundred thirty years later, does not annul a covenant previously ratified by God, so as to nullify the promise. 18For if the inheritance comes from the law, it no longer comes from the promise; but God granted it to Abraham through the promise.
19Why then the law? It was added because of transgressions, until the offspring would come to whom the promise had been made; and it was ordained through angels by a mediator. 20Now a mediator involves more than one party; but God is one. 21Is the law then opposed to the promises of God? Certainly not! For if a law had been given that could make alive, then righteousness would indeed come through the law. 22But the scripture has imprisoned all things under the power of sin, so that what was promised through faith in Jesus Christ might be given to those who believe.
From the oremus Bible Browser https://bible.oremus.org v2.9.2 30 June 2021.