Gen 18:10-15

10Then one said, “I will surely return to you in due season, and your wife Sarah shall have a son.” And Sarah was listening at the tent entrance behind him.11Now Abraham and Sarah were old, advanced in age; it had ceased to be with Sarah after the manner of women.12So Sarah laughed to herself, saying, “After I have grown old, and my husband is old, shall I have pleasure?”13The Lord said to Abraham, “Why did Sarah laugh, and say, ‘Shall I indeed bear a child, now that I am old?’14Is anything too wonderful for the Lord? At the set time I will return to you, in due season, and Sarah shall have a son.”15But Sarah denied, saying, “I did not laugh”; for she was afraid. He said, “Oh yes, you did laugh.”