1 Corinthians 7:19-24

For neither circumcision counts for anything nor uncircumcision, but keeping the commandments of God. Each one should remain in the condition in which he was called. Were you a bondservant when called? Do not be concerned about it. (But if you can gain your freedom, avail yourself of the opportunity.) For he who was called in the Lord as a bondservant is a freedman of the Lord. Likewise he who was free when called is a bondservant of Christ. You were bought with a price; do not become bondservants of men. So, brothers, in whatever condition each was called, there let him remain with God.