'Circumcision' in the Bible

It is true that circumcision is of use if you keep the law, but if you go against the law it is as if you had it not.

If those who have not circumcision keep the rules of the law, will it not be credited to them as circumcision?

And they, by their keeping of the law without circumcision, will be judges of you, by whom the law is broken though you have the letter of the law and circumcision.

The true Jew is not one who is only so publicly, and circumcision is not that which may be seen in the flesh:

But he is a Jew who is a secret one, whose circumcision is of the heart, in the spirit and not in the letter; whose praise is not from men, but from God.

How then is the Jew better off? or what profit is there in circumcision?

If God is one; and he will give righteousness because of faith to those who have circumcision, and through faith to those who have not circumcision.

Is this blessing, then, for the circumcision only, or in the same way for those who have not circumcision? for we say that the faith of Abraham was put to his account as righteousness.

How, then, was it judged? when he had circumcision, or when he had it not? Not when he had it, but when he did not have it:

And he was given the sign of circumcision as a witness of the faith which he had before he underwent circumcision: so that he might be the father of all those who have faith, though they have not circumcision, and so that righteousness might be put to their account;

And the father of circumcision to those who not only are of the circumcision, but who keep to the way of that faith which our father Abraham had before he underwent circumcision.

Now I say that Christ has been made a servant of the circumcision to give effect to the undertakings given by God to the fathers,