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. Yea, I will bless her, and she shall be (a mother of) nations. Kings of peoples shall be of her.
Then Abraham fell upon his face, and laughed, and said in his heart, Shall a child be born unto him that is a hundred years old? And shall Sarah, that is ninety years old, bear?
who were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God.
neither, because they are Abraham's seed, are they all children: but, In Isaac shall thy seed be called.
That is, it is not the children of the flesh that are children of God; but the children of the promise are reckoned for a seed.
For this is a word of promise, According to this season will I come, and Sarah shall have a son.