Genesis 17:7-10

7And I will establish my covenant between me and thee and thy seed after thee in their generations for an everlasting covenant, to be a God to thee, and to thy seed after thee. 8And I will give to thee, and to thy seed after thee, the land in which thou art a stranger, all the land of Canaan, for an everlasting possession; and I will be their God.1 9And God said to Abraham, Thou shalt keep my covenant therefore, thou, and thy seed after thee in their generations. 10This is my covenant, which ye shall keep, between me and you and thy seed after thee; Every male among you shall be circumcised.