1 Corinthians 7:17-20

But in any case each one of you should continue to live the way God has given you to live—the way you were when God called you. This is a rule I make in all the churches. If a man was already circumcised when he was called, he should not undo his circumcision. If a man was without circumcision when he was called, he should not be circumcised. It is not important if a man is circumcised or not. The important thing is obeying God’s commands. Each one of you should stay the way you were when God called you.