Genesis 17:23-27 - Abraham's Household Circumcised
23 And Abraham took Ishmael his son, and all who were born in his house, and all who were bought with his money, every male among the men of Abraham's house, and circumcised the flesh of their foreskin in the selfsame day, as God had 24 And Abraham was ninety-nine years old when he was circumcised in the flesh of his foreskin. 25 And Ishmael his son was thirteen years old when he was circumcised in the flesh of his foreskin. 26 In the selfsame day Abraham was circumcised, and Ishmael his son. 27 And all the men of his house, those born in the house, and those bought with money from a foreigner, were circumcised with him.