Genesis 17:23-27 - Abraham's Household Circumcised
23 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. 24 Abraham was 99 years old when he was circumcised, 25 and his son Ishmael was thirteen years old when he was circumcised. 26 Both Abraham and his son Ishmael were circumcised on that very day. 27 Every man born in his household as well as those who had been purchased with money from a foreigner was circumcised with him.