Genesis 17:17 YLT

¹⁵  And God saith unto Abraham, 'Sarai thy wife -- thou dost not call her name Sarai, for Sarah 'is' her name;

¹⁶  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.'

¹⁷  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?'

¹⁸  And Abraham saith unto God, 'O that Ishmael may live before Thee;'

¹⁹  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.