But that is why Moses has instituted circumcision among you- -not, indeed, that it began with him, but with our ancestors--and that is why you circumcise even on a Sabbath.
Then God made with Abraham the Covenant of Circumcision; and under it Abraham became the father of Isaac, and circumcised him when he was eight days old; and Isaac became the father of Jacob; and Jacob of the Twelve Patriarchs.
My point is this--An agreement already confirmed by God cannot be canceled by the Law, which came four hundred and thirty years later, so as to cause the promise to be set aside.