Romans 2:25

For circumcision, indeed, profits, if you do the law; but, if you are transgressors of the law, your circumcision has become uncircumcision.

Acts 7:51

Ye stiffnecked, and uncircumcised in heart and ears! ye do always resist the Holy Spirit; as your fathers did, so do ye.

Romans 2:23

You who boast in law, do you dishonor God through your transgression of the law?

Romans 2:28-2

For he is not a Jew, who is one outwardly; nor is that circumcision, which is outward in flesh;

Romans 4:11-12

And he received the sign of circumcision, a seal of the righteousness of the faith which he had while in uncircumcision; that he might be father of all who believe while in uncircumcision, that the righteousness might be reckoned to them;

Galatians 5:3-6

And I testify again to every man who is circumcised, that he is a debtor to do the whole law.

Galatians 6:15

For neither is circumcision anything, nor uncircumcision, but a new creation.

Ephesians 2:11-12

Wherefore, remember that ye, the gentiles in flesh, who are called uncircumcision by that which is called circumcision in flesh made by hand,

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
You who boast in law, do you dishonor God through your transgression of the law?
Acts 7:51
Ye stiffnecked, and uncircumcised in heart and ears! ye do always resist the Holy Spirit; as your fathers did, so do ye.