27 All the men of his house, those born in the house, and those bought with money from a foreigner, were circumcised with him.
Genesis 17:27 Cross References - WEB
Genesis 18:19
19 For I have known him, to the end that he may command his children and his household after him, that they may keep the way of Yahweh, to do righteousness and justice; to the end that Yahweh may bring on Abraham that which he has spoken of him.”