Genesis 18:11-14

Now Abraham and Sarah were old, well advanced in age; and Sarah had passed the age of childbearing. Therefore Sarah laughed within herself, saying, “After I have grown old, shall I have pleasure, my lord being old also?” And the LORD said to Abraham, “Why did Sarah laugh, saying, ‘Shall I surely bear a child, since I am old?’ Is anything too hard for the LORD? At the appointed time I will return to you, according to the time of life, and Sarah shall have a son.”