Verses 15-16
"And God said unto Abraham, As for Sarai thy wife, thou shalt not call her name Sarai, but Sarah shall her name be. And I will bless her, And moreover I will give thee a son of her, and she shall be a mother of nations; kings of peoples shall be of her."
See under Genesis 17:5 regarding the uncertainty of the meaning of the change from Abram and Sarai to Abraham and Sarah. That it was significant and that God attached great importance to it is seen in the stress these new names received in this passage. As a matter of fact, God named all of the characters featured in this chapter except Hagar.
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