1 Corinthians 7:21-23 NIV

21 Were you a slave when you were called? Don't let it trouble you--although if you can gain your freedom, do so.
22 For he who was a slave when he was called by the Lord is the Lord's freedman;1 similarly, he who was a free man when he was called is Christ's slave.2

References for 1 Corinthians 7:22

23 You were bought at a price;3 do not become slaves of men.

References for 1 Corinthians 7:23