Thematic Bible: Her miraculous conception of isaac

And God said to Abraham, As to Sarai thy wife, thou shalt not call her name Sarai, but Sarah shall be her name. And I will bless her, and I will give thee a son also of her; and I will bless her, and she shall become nations: kings of peoples shall be of her. And Abraham fell on his face and laughed, and said in his heart, Shall a child be born to him that is a hundred years old? and shall Sarah, who is ninety years old, bear? read more.
And Abraham said to God, Oh that Ishmael might live before thee! And God said, Sarah thy wife shall indeed bear thee a son; and thou shalt call his name Isaac; and I will establish my covenant with him, for an everlasting covenant for his seed after him. And for Ishmael I have heard thee: behold, I will bless him, and will make him fruitful, and will very greatly multiply him; twelve princes shall he beget, and I will make him a great nation. But my covenant will I establish with Isaac, whom Sarah shall bear to thee at this appointed time in the next year.

And they said to him, Where is Sarah thy wife? And he said, Behold, in the tent. And he said, I will certainly return to thee at this time of the year, and behold, Sarah thy wife shall have a son. And Sarah was listening at the tent-door, which was behind him. Now Abraham and Sarah were old and advanced in age: it had ceased to be with Sarah after the manner of women. read more.
And Sarah laughed within herself, saying, After I am become old, shall I have pleasure, and my lord old? And Jehovah said to Abraham, Why is this, that Sarah laughs, saying, Shall I indeed bear, when I am become old? Is any matter too wonderful for Jehovah? At the time appointed I will return to thee, at this time of the year, and Sarah shall have a son. And Sarah denied, saying, I did not laugh; for she was afraid. And he said, No; but thou didst laugh.