Genesis 17:24-28

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

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

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

And all the men of his household, those who were born in the house or bought with money from a foreigner, were circumcised with him.