Then Abraham took Ishmael his son and all the slaves who were born in his house and all who were bought with his money, every male among the men of the house of Abraham, and circumcised the flesh of their foreskin on the same day, just as God had told him to do. Bible

“born in his house.” This phrase refers to Abraham’s slaves, a point that is made very clear by being put with “bought with his money.” The child of a slave was a slave. [For more on “born in his house,” see commentary on Genesis 17:12].

Commentary for: Genesis 17:23