Romans 4:14-18

For if they which are of the law be heirs, faith is made void, and the promise made of none effect:

Because the law worketh wrath: for where no law is, there is no transgression.

Therefore it is of faith, that it might be by grace; to the end the promise might be sure to all the seed; not to that only which is of the law, but to that also which is of the faith of Abraham; who is the father of us all,

(As it is written, I have made thee a father of many nations,) before him whom he believed, even God, who quickeneth the dead, and calleth those things which be not as though they were.

Who against hope believed in hope, that he might become the father of many nations; according to that which was spoken, So shall thy seed be.