Do something to show that you really have given up your sins. Don't start saying that you belong to Abraham's family. God can turn these stones into children for Abraham.
Ezekiel, son of man, the people living in the ruined cities of Israel are saying, “Abraham was just one man, and the LORD gave him this whole land of Israel. There are many of us, and so this land must be ours.”
Once the owner of the house gets up and locks the door, you will be left standing outside. You will knock on the door and say, “Sir, open the door for us!” But the owner will answer, “I don't know a thing about you!”
Then the one who invited you will come and say, “Give your place to this other guest!” You will be embarrassed and will have to sit in the worst place.
First I preached to the people in Damascus, and then I went to Jerusalem and all over Judea. Finally, I went to the Gentiles and said, “Stop sinning and turn to God! Then prove what you have done by the way you live.”
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.