Genesis 17:2-14

²I will make my covenant between me and you, and will multiply you exceedingly." ³Abram fell on his face. God talked with him, saying, ⁴"As for me, behold, my covenant is with you. You will be the father of a multitude of nations. ⁵Neither will your name any more be called Abram, but your name will be Abraham; for the father of a multitude of nations have I made you. ⁶I will make you exceeding fruitful, and I will make nations of you. Kings will come out of you. ⁷I will establish my covenant between me and you and your seed after you throughout their generations for an everlasting covenant, to be a God to you and to your seed after you. ⁸I will give to you, and to your seed after you, the land where you are traveling, all the land of Canaan, for an everlasting possession. I will be their God."

⁹God said to Abraham, "As for you, you will keep my covenant, you and your seed after you throughout their generations. ¹⁰This is my covenant, which you shall keep, between me and you and your seed after you. Every male among you shall be circumcised. ¹¹You shall be circumcised in the flesh of your foreskin. It will be a token of a covenant between me and you. ¹²He who is eight days old will be circumcised among you, every male throughout your generations, he who is born in the house, or bought with money of any foreigner who is not of your seed. ¹³He who is born in your house, and he who is bought with your money, must be circumcised. My covenant will be in your flesh for an everlasting covenant. ¹⁴The uncircumcised male who is not circumcised in the flesh of his foreskin, that soul shall be cut off from his people. He has broken my covenant."