Genesis 17:23-26

23On that very day Abraham took his son, Ishmael, and every male in his household, including those born there and those he had bought. Then he circumcised them, cutting off their foreskins, just as God had told him.

24Abraham was ninety-nine years old when he was circumcised,

25and Ishmael, his son, was thirteen.

26Both Abraham and his son, Ishmael, were circumcised on that same day,