Genesis 17:23-26

23So Abraham took his son Ishmael and those born in his household or purchased — every male among the members of Abraham’s household — and he circumcised the flesh of their foreskin on that very day, just as God had said to him.

24Abraham was ninety-nine years old when the flesh of his foreskin was circumcised,

25and his son Ishmael was thirteen years old when the flesh of his foreskin was circumcised.

26On that very day Abraham and his son Ishmael were circumcised.