Genesis 18:10-15 New King James Version (NKJV)

10. And He said, “I will certainly return to you according to the time of life, and behold, Sarah your wife shall have a son.”(Sarah was listening in the tent door which was behind him.)

11. Now Abraham and Sarah were old, well advanced in age; and Sarah had passed the age of childbearing.

12. Therefore Sarah laughed within herself, saying, “After I have grown old, shall I have pleasure, my lord being old also?”

13. And the Lord said to Abraham, “Why did Sarah laugh, saying, ‘Shall I surely bear a child, since I am old?’

14. 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.”

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

Genesis 18