Romans 2:25

For circumcision indeed is profitable, if thou keep the law: but if thou be a transgressor of the law, thy circumcision is become uncircumcision.

Acts 7:51

Ye stiff-necked, and uncircumcised in heart and ears, ye do always resist the holy Spirit: as your fathers did, so do ye.

Romans 2:23

Thou, that boastest in the law, dost thou by transgression of the law dishonour God?

Romans 2:28-2

nor is that circumcision, which is only in appearance, in the flesh;

Romans 4:11-12

And he received the sign of circumcision as a seal of the righteousness of the faith which he had in uncircumcision: that he might be the father of all that believe though not circumcised, that righteousness may be imputed to them also:

Galatians 5:3-6

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

Galatians 6:15

For in Christ Jesus neither circumcision availeth any thing, nor uncircumcision, but being created anew.

Ephesians 2:11-12

Wherefore remember that ye were formerly Gentiles in the flesh, called uncircumcision by that which is called circumcision made by hands in the flesh;

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
Thou, that boastest in the law, dost thou by transgression of the law dishonour God?
Acts 7:51
Ye stiff-necked, and uncircumcised in heart and ears, ye do always resist the holy Spirit: as your fathers did, so do ye.