Whether born in your house or bought with your money, he must be circumcised. My covenant will be marked in your flesh as an everlasting covenant.
In context
11You must circumcise the flesh of your foreskin, and it will be the sign of the covenant between me and you. 12Every male among you, generation after generation, must be circumcised at eight days old — every male born in your household or bought with money from a foreigner who is not your offspring. 13Whether born in your house or bought with your money, he must be circumcised. My covenant will be marked in your flesh as an everlasting covenant. 14But an uncircumcised male, one whose foreskin has not been cut, will be cut off from his people — he has broken my covenant. 15As for Sarai your wife, you must no longer call her Sarai; her name will be Sarah.