Genesis 17
15 Ref And God saith unto Abraham, `Sarai thy wife -- thou dost not call her name Sarai, for Sarah `is' her name;
16 Ref 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 Ref 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 Ref And Abraham saith unto God, `O that Ishmael may live before Thee;'
19 Ref 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.