Romans 4:2, 13-15

If Abraham was made right by the things he did, he had a reason to brag. But this is not God’s view

Abraham and his descendants received the promise that they would get the whole world. He did not receive that promise through the law, but through being right with God by his faith. If people could receive what God promised by following the law, then faith is worthless. And God’s promise to Abraham is worthless, because the law can only bring God’s anger. But if there is no law, there is nothing to disobey.