Romans 4:18

18 Against all hope, Abraham in hope believed and so became the father of many nations, just as it had been said to him, “So shall your offspring be.”a

Read Romans 4:18 Using Other Translations

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.
In hope he believed against hope, that he should become the father of many nations, as he had been told, "So shall your offspring be."
Even when there was no reason for hope, Abraham kept hoping—believing that he would become the father of many nations. For God had said to him, “That’s how many descendants you will have!”