Genesis 17:23-27 - Abraham's Household Circumcised
23 And Abraham taketh Ishmael his son, and all those born in his house, and all those bought with his money -- every male among the men of Abraham's house -- and circumciseth the flesh of their foreskin, in this self-same day, as God hath spoken with him. 24 And Abraham is a son of ninety and nine years in the flesh of his foreskin being circumcised; 25 and Ishmael his son is a son of thirteen years in the flesh of his foreskin being circumcised; 26 in this self-same day hath Abraham been circumcised, and Ishmael his son; 27 and all the men of his house -- born in the house, and bought with money from the son of a stranger -- have been circumcised with him.