Romans 2:25

For circumcision indeed profits, if you do the law: but if you be a transgressor of the law, your circumcision has become uncircumcision.

Acts 7:51

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

Romans 2:23

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

Romans 2:28-2

For he is not a Jew who is one outwardly; neither is circumcision that which is outwardly in the flesh.

Romans 4:11-12

And he received the sign of circumcision, and the seal of the righteousness of the faith which he had in uncircumcision: that he should be the father of all who believed, through uncircumcision; and righteousness should be imputed to them;

Galatians 5:3-6

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

Galatians 6:15

for neither is circumcision anything, nor uncircumcision, but a new creature.

Ephesians 2:11-12

Therefore remember, that when you were Gentiles in the flesh, called Uncircumcision by that which is called Circumcision, made in the flesh with 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
do you, who boast in the law, through the transgression of the law dishonor God?
Acts 7:51
Ye stiffnecked and uncircumcised in heart and ears, you do always resist the Holy Ghost; as your fathers did, so do ye.