¹And 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 with integrity, ²and I will perform my covenant between myself and you, and I will increase you very greatly.” ³Then Abram fell face down, and God spoke with him and said, ⁴“As for me, behold, my covenant is with you, and you will become the father of a multitude of nations. ⁵And you will no longer be called Abram, but your name will be Abraham, for I will make you the father of a multitude of nations. ⁶And I will make you extremely fruitful, and I will constitute you as nations, and kings will come out of you. ⁷And I will set up my covenant between myself and you and your seed after you for their generations, as an age-abiding covenant, so as to be God to you, and to your seed after you. ⁸And I will give you and your seed after you the land in which you are resident – the whole of the land of Canaan – as an age-abiding possession, and I will be God to them.” ⁹Then God said to Abraham, “And you shall keep my covenant, you and your seed after you, for their generations. ¹⁰This is my covenant which you shall keep between myself and you, and with your seed after you: for all males among you to be circumcised. ¹¹And you will be circumcised in the flesh of your foreskin, and it will be a sign of a covenant between me and you. ¹²And at eight days old, every male among you will be circumcised in your generations, whether born in the household or bought for money, including any foreigner who is not of your seed. ¹³He who is born in your household and he who is bought for your money absolutely must be circumcised, and my covenant will be in your flesh as an age-abiding covenant. ¹⁴And as for any uncircumcised male, whose flesh of his foreskin is not circumcised – that person will be cut off from his people; he has broken my covenant.” ¹⁵Then God said to Abraham, “As for Sarai your wife, you will not call her Sarai, but her name will be Sarah. ¹⁶And I will bless her, and I will also give you a son by her, and I will bless her, and she will give rise to nations; kings of peoples will spring up from her.” ¹⁷Then Abraham fell face down and laughed and said in his heart, “Will a child be born to a one-hundred-year-old, and will Sarah who is ninety years old give birth?” ¹⁸And Abraham said to God, “If only Ishmael would live before you!” ¹⁹And God said, “Nevertheless, Sarah your wife will bear you a son, and you will call him Isaac, and I will set up my covenant with him, as an age-abiding covenant to his seed after him. ²⁰But as for Ishmael, I have heard you. Behold, I have blessed him, and I will make him fruitful, and I will make him numerous to a very great degree. He will beget twelve princes, and I will make him a great nation. ²¹But I will set up my covenant with Isaac whom Sarah will bear to you, at this time of year in another year.” ²²Then he finished speaking with him, and God went up away from Abraham. ²³So Abraham took Ishmael his son, and all those born in his household, and all those bought for his money – every male among the men of Abraham's household – and circumcised the flesh of their foreskin on that very day, as God had told him. ²⁴And Abraham was ninety-nine years old when he was circumcised in the flesh of his foreskin. ²⁵And Ishmael his son was thirteen years old when he was circumcised in the flesh of his foreskin. ²⁶On that very day Abraham and Ishmael his son were circumcised, ²⁷as were all the men of his household – born in the household or bought for money from a foreigner – they were circumcised with him.

Reference(s) in Chapter 17: v.5 ↔ Romans 4:17.