Genesis 17:25 DBY

²³  And Abraham took Ishmael his son, and all who were born in his house, and all who were bought with his money -- every male among the people of Abraham's house -- and circumcised the flesh of their foreskin on that same day, as God had said to him.

²⁴  And Abraham was ninety-nine years old when he was circumcised in the flesh of his foreskin.

²⁵  And Ishmael his son was thirteen years old when he was circumcised in the flesh of his foreskin.

²⁶  In the selfsame day was Abraham circumcised, and Ishmael his son;

²⁷  and all the men of his house, born in his house, or bought with money of the stranger, were circumcised with him.