Genesis 17:1-12a, 15-16
The Sign of the Covenant
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 make you exceedingly numerous.” Then Abram fell on his face; and God said to him, “As for me, this is my covenant with you: You shall be the ancestor of a multitude of nations. No longer shall your name be Abram, but your name shall be Abraham; for I have made you the ancestor of a multitude of nations. I will make you exceedingly fruitful; and I will make nations of you, and kings shall come from you. I will establish my covenant between me and you, and your offspring after you throughout their generations, for an everlasting covenant, to be God to you and to your offspring after you. And I will give to you, and to your offspring after you, the land where you are now an alien, all the land of Canaan, for a perpetual holding; and I will be their God.”
God said to Abraham, “As for you, you shall keep my covenant, you and your offspring after you throughout their generations. This is my covenant, which you shall keep, between me and you and your offspring after you: Every male among you shall be circumcised. You shall circumcise the flesh of your foreskins, and it shall be a sign of the covenant between me and you. Throughout your generations every male among you shall be circumcised when he is eight days old, including the slave born in your house and the one bought with your money from any foreigner who is not of your offspring.
God said to Abraham, “As for Sarai your wife, you shall not call her Sarai, 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 give rise to nations; kings of peoples shall come from her.”