Genesis 17:23-27

23Abraham took his son Ishmael and every male in his household (whether born in his house or bought with money) and circumcised them on that very same day, just as God had told him to do.

24Now Abraham was 99 years old when he was circumcised;

25his son Ishmael was thirteen years old when he was circumcised.

26Abraham and his son Ishmael were circumcised on the very same day.

27All the men of his household, whether born in his household or bought with money from a foreigner, were circumcised with him.