Romans 2:25

Circumcision has its value, if you are obeying the Law. But, if you are a breaker of the Law, your circumcision is no better than uncircumcision.

Acts 7:51

O! stubborn race, heathen in heart and ears, you are for ever resisting the Holy Spirit; your ancestors did it, and you are doing it still.

Romans 2:23

Boasting, as you do, of your Law, do you dishonor God by breaking the Law?

Romans 2:28-2

For a man who is only a Jew outwardly is not a real Jew; nor is outward bodily circumcision real circumcision. The real Jew is the man who is a Jew in soul;

Romans 4:11-12

Not after, but before. And it was as a sign of this that he received the rite of circumcision-to attest the righteousness due to the faith of an uncircumcised man-in order that he might be the father of all who have faith in God even when uncircumcised, that they also may be regarded by God as righteous;

Galatians 5:3-6

I again declare to every one who receives circumcision, that he binds himself to obey the whole Law.

Galatians 6:15

For neither is circumcision nor the omission of it anything; but a new nature is everything.

Ephesians 2:11-12

Remember, therefore, that you were once Gentiles yourselves, as your bodies showed; you were called 'The Uncircumcised' by those who were called 'The Circumcised'--circumcised only by the hand of man!

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
Boasting, as you do, of your Law, do you dishonor God by breaking the Law?
Acts 7:51
O! stubborn race, heathen in heart and ears, you are for ever resisting the Holy Spirit; your ancestors did it, and you are doing it still.