1 Corinthians 7:21-24

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.