Genesis 18:9-15

9They said to him, "Where is Sarah your wife?" And he said, "She is in the tent."

10The Lord said, "I will surely return to you about this time next year, and Sarah your wife shall have a son." And Sarah was listening at the tent door behind him.

11Now Abraham and Sarah were old, advanced in years. The way of women had ceased to be with Sarah.

12So Sarah laughed to herself, saying, "After I am worn out, and my lord 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 hard for the Lord? At the appointed time I will return to you, about this time next year, and Sarah shall have a son."

15But Sarah denied it, saying, "I did not laugh," for she was afraid. He said, "No, but you did laugh."