Circumcision: Abraham
Source: Nav
Genesis 17:23–27
On that very day Abraham took his son Ishmael and all those born in his household or purchased with his money—every male among the members of Abraham’s household—and he circumcised them, just as God had told him. / So Abraham was ninety-nine years old when he was circumcised, / and his son Ishmael was thirteen;
Genesis 21:3, 4
And Abraham gave the name Isaac to the son Sarah bore to him. / When his son Isaac was eight days old, Abraham circumcised him, as God had commanded him.