1 Corinthians 7:18-20

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.