Genesis 17:24-27 ▼

24 So Abraham was ninety-nine years old when he was circumcised.

25 And Ishmael his son was thirteen years old when he was circumcised.

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

27 All the men [servants] of his household, both those born in the house and those purchased with money from a foreigner, were circumcised along with him [as the sign of God’s covenant with Abraham].