Romans 4:2, 13-15

For if Abraham was justified by works, he hath whereof to glory; but not toward God.

For not through the law was the promise to Abraham or to his seed that he should be heir of the world, but through the righteousness of faith. For if they that are of the law are heirs, faith is made void, and the promise is made of none effect: for the law worketh wrath; but where there is no law, neither is there transgression.