Genesis 18:9-14

“Where is your wife Sarah?” they asked him. “There, in the tent,” he answered. The LORD said, “I will certainly come back to you in about a year’s time, and your wife Sarah will have a son!” Now Sarah was listening at the entrance of the tent behind him. Abraham and Sarah were old and getting on in years. Sarah had passed the age of childbearing. So she laughed to herself: “After I am worn out and my lord is old, will I have delight?” But the LORD asked Abraham, “Why did Sarah laugh, saying, ‘Can I really have a baby when I’m old?’ Is anything impossible for the LORD? At the appointed time I will come back to you, and in about a year she will have a son.”