from:http//www.thebricktestament.com
When Abram was ninety-nine years old Yahweh appeared to him and said, ...I shall grant a covenant between myself and you, and make you very numerous. And Abram bowed to the ground.
For my part, this is my covenant with you: you will be the father of many nations. And you are no longer to be called Abram; your name is to be Abraham...and to your descendants after you, I shall give the country where you are now immigrants, the entire land of Canaan, to own in perpetuity.
God further said to Abraham. You for your part must keep my covenant, you and your descendants after you, generation after generation. This is my covenant which you must keep between myself and you, and your descendants after you: every one of your males must be circumcised.
As soon as he is eight days old, every one of your males, generation after generation, must be circumcised, including slaves born within the household or bought from a foreigner not of your descent.
Furthermore God said to Abram, As regards your wife, you must not call her Sarai, but Sarah. Yes, your wife Sarah will bear you a son whom you must name Isaac. I shall come back to you next year, and then your wife Sarah will have a son.
Sarah was listening at the entrance of the tent behind him. Now Abraham and Sarah were old, well on in years, and Sarah had ceased to have her monthly periods. So Sarah laughed to herself, thinking, Now that I am past the age of childbearing and my husband is an old man, is pleasure to come my way again?