When Abram was ninety-nine years old the LORD appeared to Abram, and said to him, "I am God Almighty; walk before me, and be blameless.
And I will make my covenant between me and you, and will multiply you exceedingly."
Then Abram fell on his face; and God said to him,
"Behold, my covenant is with you, and you shall be the father of a multitude of nations.
No longer shall your name be Abram, but your name shall be Abraham; for I have made you the father of a multitude of nations.
I will make you exceedingly fruitful; and I will make nations of you, and kings shall come forth from you.
And I will establish my covenant between me and you and your descendants after you throughout their generations for an everlasting covenant, to be God to you and to your descendants after you.
And I will give to you, and to your descendants after you, the land of your sojournings, all the land of Canaan, for an everlasting possession; and I will be their God."
And God said to Abraham, "As for you, you shall keep my covenant, you and your descendants after you throughout their generations.
This is my covenant, which you shall keep, between me and you and your descendants after you: Every male among you shall be circumcised.
You shall be circumcised in the flesh of your foreskins, and it shall be a sign of the covenant between me and you.
He that is eight days old among you shall be circumcised; every male throughout your generations, whether born in your house, or bought with your money from any foreigner who is not of your offspring,
both he that is born in your house and he that is bought with your money, shall be circumcised. So shall my covenant be in your flesh an everlasting covenant.
Any uncircumcised male who is not circumcised in the flesh of his foreskin shall be cut off from his people; he has broken my covenant."
And God said to Abraham, "As for Sar'ai your wife, you shall not call her name Sar'ai, but Sarah shall be her name.
I will bless her, and moreover I will give you a son by her; I will bless her, and she shall be a mother of nations; kings of peoples shall come from her."
Then Abraham fell on his face and laughed, and said to himself, "Shall a child be born to a man who is a hundred years old? Shall Sarah, who is ninety years old, bear a child?"
And Abraham said to God, "O that Ish'mael might live in thy sight!"
God said, "No, but Sarah your wife shall bear you a son, and you shall call his name Isaac. I will establish my covenant with him as an everlasting covenant for his descendants after him.
As for Ish'mael, I have heard you; behold, I will bless him and make him fruitful and multiply him exceedingly; he shall be the father of twelve princes, and I will make him a great nation.
But I will establish my covenant with Isaac, whom Sarah shall bear to you at this season next year."
When he had finished talking with him, God went up from Abraham.
Then Abraham took Ish'mael his son and all the slaves born in his house or bought with his money, every male among the men of Abraham's house, and he circumcised the flesh of their foreskins that very day, as God had said to him.
Abraham was ninety-nine years old when he was circumcised in the flesh of his foreskin.
And Ish'mael his son was thirteen years old when he was circumcised in the flesh of his foreskin.
That very day Abraham and his son Ish'mael were circumcised;
and all the men of his house, those born in the house and those bought with money from a foreigner, were circumcised with him.
Revised Standard Version of the Bible, copyright 1952 [2nd edition, 1971] by the Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved. (Revised Standard Version - Holy Bible)