18 Was a man already circumcised when he was called? He should not become uncircumcised. Was a man still uncircumcised when called? He should not be circumcised.
1 Corinthians 7:18 Cross References - MSB
Acts 15:1-2
1 Then some men came down from Judea and were teaching the brothers, “Unless you are circumcised according to the custom of Moses, you cannot be saved.”
2 Therefore after engaging these men in sharp debate, Paul and Barnabas were appointed, along with some other believers, to go up to Jerusalem to see the apostles and elders about this question.
Acts 15:5
5 But some believers from the party of the Pharisees stood up and declared, “The Gentiles must be circumcised and required to obey the law of Moses.”
Acts 15:19
19 It is my judgment, therefore, that we should not cause trouble for the Gentiles who are turning to God.
Acts 15:24
24 It has come to our attention that some went out from us without our authorization and unsettled you, troubling your minds by saying that you must be circumcised and keep the law.
Acts 15:28
28 It seemed good to the Holy Spirit and to us not to burden you with anything beyond these essential requirements:
Galatians 5:1-3
1 In the freedom with which Christ has set us free, stand firm, then, and do not be encumbered once more by a yoke of slavery.
2 Take notice: I, Paul, tell you that if you let yourselves be circumcised, Christ will be of no value to you at all.
3 Again I testify to every man who gets himself circumcised that he is obligated to obey the whole law.
Colossians 3:11
11 Here there is no Greek or Jew, circumcised or uncircumcised, barbarian, Scythian, slave, or free, but Christ is all and is in all.