Genesis 17:23-27

Living Bible

²³ Then, that very day, Abraham took Ishmael his son and every other male—born in his household or bought from outside—and cut off their foreskins, just as God had told him to. ^24-27 Abraham was ninety-nine years old at that time, and Ishmael was thirteen. Both were circumcised the same day, along with all the other men and boys of the household, whether born there or bought as slaves.