If Abraham and his descendants were given this promise because they had obeyed a law, then faith would mean nothing, and the promise would be worthless.
You people of Judah and Jerusalem may have big plans, but here in this valley I'll ruin those plans. I'll let your enemies kill you, and I'll tell the birds and wild animals to eat your dead bodies.
But if he hears about the promise and does object, she no longer has to keep it. The LORD will forgive her, because her husband would not allow her to keep the promise.
Everything depends on having faith in God, so that God's promise is assured by his great kindness. This promise isn't only for Abraham's descendants who have the Law. It is for all who are Abraham's descendants because they have faith, just as he did. Abraham is the ancestor of us all.
and to know that I belong to him. I could not make myself acceptable to God by obeying the Law of Moses. God accepted me simply because of my faith in Christ.
The Law appoints priests who have weaknesses. But God's promise, which came later than the Law, appoints his Son. And he is the perfect high priest for ever.