Galatians 3:15-17 New Revised Standard Version, Anglicised (NRSVA)
The Promise to Abraham
15 Brothers and sisters,[a] I give an example from daily life: once a person’s will[b] has been ratified, no one adds to it or annuls it. 16 Now the promises were made to Abraham and to his offspring;[c] it does not say, ‘And to offsprings’,[d] as of many; but it says, ‘And to your offspring’,[e] that is, to one person, who is Christ. 17 My point is this: the law, which came four hundred and thirty years later, does not annul a covenant previously ratified by God, so as to nullify the promise.