Thematic Bible: Circumcision of

Here is my covenant that you are to observe, between me and you and your descendants: Every male among you is to be circumcised. 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. Generation after generation, every male among you is to be circumcised on the eighth day after his birth, including the servant born in your house or the one purchased from a foreigner, who is not of your offspring. read more.
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. Any uncircumcised male who does not have the foreskin of his flesh circumcised on the eighth day after his birth is to be eliminated from his people because he has broken my covenant."

Abraham took his son Ishmael and all the servants born in his house or purchased with his money every male among the men of his household and circumcised them that very day, just as God had spoken to him. Abraham was 99 years old when he was circumcised, and his son Ishmael was thirteen years old when he was circumcised. read more.
Both Abraham and his son Ishmael were circumcised on that very day. Every man born in his household as well as those who had been purchased with money from a foreigner was circumcised with him.