Genesis 17:23-25

King James Version

²³ And Abraham took Ishmael his son, and all that were born in his house, and all that were bought with his money, every male among the men of Abraham's house; and circumcised the flesh of their foreskin in the selfsame day, as God had said unto him.

²⁴ And Abraham was ninety years old and nine, 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.