Genesis 17:11-13

International Standard Version

¹¹ You are all to be circumcised in the flesh of your foreskin, and this is to be the sign of the covenant between me and you. ¹² Generation after generation, every male among you is to be circumcised on the eighth day after his birth,^[a] including the servant born in your house or the one purchased from a foreigner, who is not of your offspring. ¹³ The servant born in your house or the one purchased with money is to be circumcised. My covenant is to remain in your flesh as an eternal covenant.