1 Corinthians 7:18-20

18 If a circumcised man has accepted God's call, he should not try to remove the marks of circumcision; if an uncircumcised man has accepted God's call, he should not get circumcised.

19 For whether or not a man is circumcised means nothing; what matters is to obey God's commandments.

20 Each of you should remain as you were when you accepted God's call.