Genesis 18:9-15

9And they said to him, Where is Sarah thy wife? And he said, Behold, in the tent. 10And he said, I will certainly return to thee according to the time of life; and, lo, Sarah thy wife shall have a son. And Sarah heard it in the tent door, which was behind him. 11Now Abraham and Sarah were old and well advanced in years; and it ceased to be with Sarah after the manner of women. 12Therefore Sarah laughed within herself, saying, After I am become old shall I have pleasure, my lord being old also? 13And the LORD said to Abraham, Why did Sarah laugh, saying, Shall I certainly bear a child, who am old? 14Is any thing too hard for the LORD? At the time appointed I will return to thee, according to the time of life, and Sarah shall have a son. 15Then Sarah denied, saying, I laughed not; for she was afraid. And he said, Nay; but thou didst laugh.