Genesis 18:13-15

And the LORD said to Abraham, “Why did Sarah laugh, saying, ‘Shall I indeed bear a child, when I am so old?’ Is anything too difficult for the LORD? At the appointed time I will return to you, at this time next year, and Sarah will have a son.” Sarah denied it however, saying, “I did not laugh”; for she was afraid. And He said, “No, but you did laugh.”