Genesis 17:16-17
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16I will bless her, and indeed I will give you a son by her. Then I will bless her, and she shall be a mother of nations; kings of peoples will come from her.” 17Then Abraham fell on his face and laughed, and said in his heart, “Will a child be born to a man a hundred years old? And will Sarah, who is ninety years old, give birth to a child?”