Genesis 17:25-27

Revised Standard Version

²⁵ And Ish′mael his son was thirteen years old when he was circumcised in the flesh of his foreskin. ²⁶ That very day Abraham and his son Ish′mael were circumcised; ²⁷ and all the men of his house, those born in the house and those bought with money from a foreigner, were circumcised with him.