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 give thee a son also of her: yea, I will bless her, and she shall be a mother of nations; kings of people 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 an hundred years old? and shall Sarah, that is ninety years old, bear?
Which 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 the seed of Abraham, are they all children: but, In Isaac shall thy seed be called.
That is, They which are the children of the flesh, these are not the children of God: but the children of the promise are counted for the seed.
For this is the word of promise, At this time will I come, and Sara shall have a son.