16:15And Hagar bare Abram a son: and Abram called his son's name, which Hagar bare, Ishmael.

17:23And 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.