Genesis Chapter 17

17:1-8
And when Abram was ninety years old and nine, the Lord appeared to Abram, and said unto him, I am the Almighty God; walk before me, and be thou perfect.
And I will make my covenant between me and thee, and will multiply thee exceedingly.
And Abram fell on his face: and God talked with him, saying,
As for me, behold, my covenant is with thee, and thou shalt be a father of many nations.
Neither shall thy name any more be called Abram, but thy name shall be Abraham; for a father of many nations have I made thee.
And I will make thee exceeding fruitful, and I will make nations of thee, and kings shall come out of thee.
And I wil establish my covenant between me and thee and thy seed after thee in their generations for an everlasting covenant, to be a God unto thee, and to thy seed after thee.
And I will give unto thee, and to thy seed after thee, the land wherein thou art a stranger, all the land of Canaan, for an everlasting posession; and I will be their God.

17:15-18
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, andn 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 Abraham said unto God, O that Ishmael might live before thee!