Genesis 18:9-14

Then they said to him, “Where is Sarah your wife?” And he said, “There, in the tent.” He said, “I will surely return to you at this time next year; and behold, Sarah your wife will have a son.” And Sarah was listening at the tent door, which was behind him. [Rom 9:9-12] Now Abraham and Sarah were old, well advanced in years; she was past [the age of] childbearing. So Sarah laughed to herself [when she heard the LORD’S words], saying, “After I have become old, shall I have pleasure and delight, my lord (husband) being also old?” [1 Pet 3:6] And the LORD asked Abraham, “Why did Sarah laugh [to herself], saying, ‘Shall I really give birth [to a child] when I am so old?’ Is anything too difficult or too wonderful for the LORD? At the appointed time, when the season [for her delivery] comes, I will return to you and Sarah will have a son.” [Matt 19:26]