Bible Verses About Circumcision: A seal of righteousness

Circumcision profiteth indeed, if thou keep the law: but if thou be a transgressor of the law, thy circumcision is made uncircumcision.

If then, the uncircumcised keep the justices of the law, shall not this uncircumcision be counted for circumcision?

And shall not that which by nature is uncircumcision, if it fulfil the law, judge thee, who by the letter and circumcision art a transgressor of the law?

For it is not he is a Jew, who is so outwardly: nor is that circumcision which is outwardly in the flesh.

But he is a Jew that is one inwardly and the circumcision is that of the heart, in the spirit not in the letter: whose praise is not of men, but of God.