When Abram was ninety-nine years old, God appeared to Abram and said to him, "I am El Shaddai. Walk in My ways and be blameless. I will establish My covenant between Me and you, and I will make you exceedingly numerous."
Abram threw himself on his face; and God spoke to him further, "As for Me, this is My covenant with you: You shall be the father of a multitude of nations. And you shall no longer be called Abram, but your name shall be Abraham, for I make you the father of a multitude of nations. I will make you exceedingly fertile, and make nations of you; and kings shall come forth from you. I will maintain My covenant between Me and you, and your offspring to come, as an everlasting covenant throughout the ages, to be God to you and to your offspring to come. I assign the land you sojourn in to you and your offspring to come, all the land of Canaan, as an everlasting holding. I will be their God."
God said further to Abraham, "As for you, you and your offspring to come throughout the ages shall keep My covenant. Such shall be the covenant between Me and you and your offspring to follow which you shall keep: every male among you shall be circumcised. You shall circumcise the flesh of your foreskin, and that shall be the sign of the covenant between Me and you. And throughout the generations, every male among you shall be circumcised at the age of eight days. As for the homeborn slave and the one bought from an outsider who is not of your offspring, they must be circumcised, homeborn and purchased alike. Thus shall My covenant be marked in your flesh as an everlasting pact. And if any male who is uncircumcised fails to circumcise the flesh of his foreskin, that person shall be cut off from his kin; he has broken My covenant."
And God said to Abraham, "As for your wife Sarai, you shall not call her Sarai, but her name shall be Sarah. I will bless her; indeed, I will give you a son by her. I will bless her so that she shall give rise to nations; rulers of peoples shall issue from her."
From TANAKH: The New JPS Translation According to the Traditional Hebrew Text. Copyright 1985 by the Jewish Publication Society. Used by permission.