Genesis 17:25-27

Amplified Bible

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].