Thematic Bible: Her miraculous conception of isaac

And God saith unto Abraham, 'Sarai thy wife -- thou dost not call her name Sarai, for Sarah is her name; and I have blessed her, and have also given to thee a son from her; and I have blessed her, and she hath become nations -- kings of peoples are from her.' And Abraham falleth upon his face, and laugheth, and saith in his heart, 'To the son of an hundred years is one born? or doth Sarah -- daughter of ninety years -- bear?' read more.
And Abraham saith unto God, 'O that Ishmael may live before Thee;' and God saith, 'Sarah thy wife is certainly bearing a son to thee, and thou hast called his name Isaac, and I have established My covenant with him, for a covenant age-during, to his seed after him. As to Ishmael, I have heard thee; lo, I have blessed him, and made him fruitful, and multiplied him, very exceedingly; twelve princes doth he beget, and I have made him become a great nation; and My covenant I establish with Isaac, whom Sarah doth bear to thee at this appointed time in the next year;'

And they say unto him, 'Where is Sarah thy wife?' and he saith, 'Lo -- in the tent;' and he saith, 'returning I return unto thee, about the time of life, and lo, to Sarah thy wife a son.' And Sarah is hearkening at the opening of the tent, which is behind him; read more.
and Abraham and Sarah are aged, entering into days -- the way of women hath ceased to be to Sarah; and Sarah laugheth in her heart, saying, 'After I have waxed old I have had pleasure! -- my lord also is old!' And Jehovah saith unto Abraham, 'Why is this? Sarah hath laughed, saying, Is it true really -- I bear -- and I am aged? Is any thing too wonderful for Jehovah? at the appointed time I return unto thee, about the time of life, and Sarah hath a son.' And Sarah denieth, saying, 'I did not laugh;' for she hath been afraid; and He saith, 'Nay, but thou didst laugh.'