Genesis 17:7-10

7I will establish my covenant as an everlasting covenant between me and you and your descendants after you for the generations to come, to be your God and the God of your descendants after you. 8The whole land of Canaan, where you now reside as a foreigner, I will give as an everlasting possession to you and your descendants after you; and I will be their God.” 9Then God said to Abraham, “As for you, you must keep my covenant, you and your descendants after you for the generations to come. 10This is my covenant with you and your descendants after you, the covenant you are to keep: Every male among you shall be circumcised.