Genesis 17:27

All the men [servants] of his household, both those born in the house and those purchased with money from a foreigner, were circumcised along with him [as the sign of God’s covenant with Abraham].

Genesis 18:19

For I have known (chosen, acknowledged) him [as My own], so that he may teach and command his children and [the sons of] his household after him to keep the way of the Lord by doing what is righteous and just, so that the Lord may bring upon Abraham what He has promised him.”

Treasury of Scripture Knowledge did not add