And God said unto Abraham,
As for Sarai your wife, you shall not call her name Sarai, but Sarah shall her name be.
All Commentaries on Genesis 17:15 Go To Genesis 17
[God] said, “And you shall not call your wife Sarai but Sarah,” that is, “You shall not call her ‘my ruler’ but ‘ruler.’ ” [This change teaches] clearly that since she had become a companion and sharer of such great faith, he should call her [by a name that expressed what] he understood her to be: not exclusively the ruler of his own house but ruler absolutely, that is, the parent of all rightly believing women. Hence, when blessed Peter was urging believing women from the nations to the virtues of humility, chastity and modesty, he remembered our mother Sarah with due praise, saying, “Just as Sarah was obedient to Abraham, calling him lord, you are her daughters when you do rightly and do not fear any disturbance.”