Genesis 17:24-27 NIV

24 Abraham was ninety-nine years old1 when he was circumcised,2

References for Genesis 17:24

25 and his son Ishmael3 was thirteen;

References for Genesis 17:25

26 Abraham and his son Ishmael were both circumcised on that same day.
27 And every male in Abraham's household4, including those born in his household or bought from a foreigner, was circumcised with him.

References for Genesis 17:27