And Abram and Nahor took them wives: the name of Abram's wife was Sarai; and the name of Nahor's wife, Milcah, the daughter of Haran, the father of Milcah, and the father of Iscah.

But Sarai was barren; she had no child.

And God said unto Abraham, As for Sarai thy wife, thou shalt not call her name Sarai, but Sarah shall her name be.

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?

And God said, Sarah thy wife shall bear thee a son indeed; and thou shalt call his name Isaac: and I will establish my covenant with him for an everlasting covenant, and with his seed after him.

And he said, I will certainly return unto thee according to the time of life; and, lo, Sarah thy wife shall have a son. And Sarah heard it in the tent door, which was behind him.

Therefore Sarah laughed within herself, saying, After I am waxed old shall I have pleasure, my lord being old also?

Is any thing too hard for the LORD? At the time appointed I will return unto thee, according to the time of life, and Sarah shall have a son.

And the LORD visited Sarah as he had said, and the LORD did unto Sarah as he had spoken.

And Abraham called the name of his son that was born unto him, whom Sarah bare to him, Isaac.

And Abraham was an hundred years old, when his son Isaac was born unto him.

And she said, Who would have said unto Abraham, that Sarah should have given children suck? for I have born him a son in his old age.

And being not weak in faith, he considered not his own body now dead, when he was about an hundred years old, neither yet the deadness of Sara's womb:

Wherefore she said unto Abraham, Cast out this bondwoman and her son: for the son of this bondwoman shall not be heir with my son, even with Isaac.

And Abraham gave all that he had unto Isaac.