'Promise' in the Bible

For the promise to Abraham or to his descendants that he would inherit the world was not through the law, but through the righteousness that comes by faith.

If those who are of the law are heirs, faith is made empty and the promise is canceled.

This is why the promise is by faith, so that it may be according to grace, to guarantee it to all the descendants—not only to those who are of the law but also to those who are of Abraham’s faith. He is the father of us all

He did not waver in unbelief at God’s promise but was strengthened in his faith and gave glory to God,

That is, it is not the children by physical descent who are God’s children, but the children of the promise are considered to be the offspring.

For this is the statement of the promise: At this time I will come, and Sarah will have a son.