1 Corinthians 7:17-20

Only, let each one live the life which the Lord has assigned him, and to which God has called him [for each person is unique and is accountable for his choices and conduct, let him walk in this way]. This is the rule I make in all the churches. Was anyone at the time of his calling [from God already] circumcised? He is not to become uncircumcised. Has anyone been called while uncircumcised? He is not to be circumcised. [Gal 5:1-3] Circumcision is nothing, and uncircumcision is nothing, but what matters is keeping the commandments of God. Each one should remain in the condition in which he was [when he was] called.