Romans 3:1
What is the advantage, then, of being a Jew? or what is the good of circumcision?
Romans 2:25-29
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.
1 Corinthians 15:32
If with only human hopes I had fought in the arena at Ephesus, what should I have gained by it? If the dead do not rise, then-'Let us eat and drink, for to-morrow we shall die'!
Hebrews 13:9
Do not let yourselves be carried away by the various novel forms of teaching. It is better to rely for spiritual strength upon the divine help, than upon regulations regarding food; for those whose lives are guided by such regulations have not found them of service.