Genesis17:12
Translation
And when he is eight days old every male among you shall be circumcised in your generations, he who is born in your house, or he who is bought with money from any man who is a foreigner, who is not your own descendants.
Paraphrase
When he is
eight days old, every male
under your authority must be
circumcised; this must be done for all generations to come, and must include not only those born in your house, but also the slaves bought with money from foreigners,
i.e. those who are not your own descendants.