Romans 2:25

Circumcision will help you only if you observe the Law; but if you are a lawbreaker, you might as well be uncircumcised.

Acts 7:51

You stubborn people, with heathen hearts and ears, you are always opposing the holy Spirit, just as your forefathers did!

Romans 2:23

Will you boast of the Law and yet dishonor God by breaking it?

Romans 2:28-2

For the real Jew is not the man who is one outwardly, and the real circumcision is not something physical and external.

Romans 4:11-12

and he was afterward given the mark of circumcision as the stamp of God's acknowledgment of the uprightness based on faith that was his before he was circumcised, so that he should be the forefather of all who, without being circumcised, have faith and so are credited with uprightness,

Galatians 5:3-6

I insist again to any man who lets himself be circumcised, that he is under obligation to obey the whole Law.

Galatians 6:15

For neither circumcision nor the want of it is of any importance, but only a new creation.

Ephesians 2:11-12

So remember that you were once physically heathen, and called uncircumcised by those who called themselves circumcised, though only physically, by human hands.

Treasury of Scripture Knowledge

Summary

For circumcision verily profiteth, if thou keep the law: but if thou be a breaker of the law, thy circumcision is made uncircumcision.

Bible References

But if

Romans 2:23
Will you boast of the Law and yet dishonor God by breaking it?
Acts 7:51
You stubborn people, with heathen hearts and ears, you are always opposing the holy Spirit, just as your forefathers did!