Then God said to Abraham, “As for you, you must keep my covenant, you and your descendants after you for the generations to come. This is my covenant with you and your descendants after you, the covenant you are to keep: ((( Every male among you shall be circumcised. ))) You are to undergo circumcision, and it will be the sign of the covenant between me and you. For the generations to come every male among you who is eight days old must be circumcised, including those born in your household or bought with money from a foreigner—those who are not your offspring. Whether born in your household or bought with your money, they must be circumcised. ((( My covenant in your flesh is to be an everlasting ))) covenant. Any uncircumcised male, who has not been circumcised in the flesh, will be cut off from his people; he has broken my covenant.”
Gensis 17:9
Abraham was ninety-nine years old when he was circumcised in the flesh of his foreskin. That very same day Abraham was circumcised, and his son Ishmael;
Genesis 17:24
All the men who went out of the city gate agreed with Hamor and his son Shechem, and every male in the city was circumcised. Three days later, while all of them were still in pain, two of Jacob’s sons, Simeon and Levi, Dinah’s brothers, took their swords and attacked the unsuspecting city, killing every male.
Genesis 34:24