¹¹ Abraham and Sarah were both very old by this time, and Sarah was long past the age of having children.

¹⁷ Then Abraham bowed down to the ground, but he laughed to himself in disbelief. “How could I become a father at the age of 100?” he thought. “And how can Sarah have a baby when she is ninety years old?”

¹¹ It was by faith that even Sarah was able to have a child, though she was barren and was too old. She believed^[a] that God would keep his promise. ¹² And so a whole nation came from this one man who was as good as dead—a nation with so many people that, like the stars in the sky and the sand on the seashore, there is no way to count them.

¹⁸ 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!”^{[a] 19} And Abraham’s faith did not weaken, even though, at about 100 years of age, he figured his body was as good as dead—and so was Sarah’s womb.

²⁰ Abraham never wavered in believing God’s promise. In fact, his faith grew stronger, and in this he brought glory to God. ²¹ He was fully convinced that God is able to do whatever he promises.

¹⁹ Abraham reasoned that if Isaac died, God was able to bring him back to life again. And in a sense, Abraham did receive his son back from the dead.