Also your eight-day-olds must be circumcised, every male, throughout your generations, including a house-born slave or a slave bought with money from any foreigner who is not of your seed.
Then Abraham took Ishmael his son and all of his house-born slaves and all his purchased slaves—every male among the men of Abraham’s house—and he circumcised the flesh of their foreskin on this very same day, just as God had spoken with him.
“Then God gave Abraham the covenant of circumcision. So he became the father of Isaac and circumcised him on the eighth day, and so Isaac with Jacob, and Jacob with the twelve patriarchs.