Genesis 17:23-26

23Then Abraham took his son Ishmael, and all the slaves who were 1born in his house and all who were bought with his money, every male among the men of Abraham’s household, and circumcised the flesh of their foreskin on this very same day, 2as God had said to him.

24Now Abraham was ninety-nine years old when 3he was circumcised in the flesh of his foreskin.

25And his son 4Ishmael was thirteen years old when he was circumcised in the flesh of his foreskin.

26On this very same day Abraham was circumcised, as well as his son Ishmael.