1 Corinthians 7:19-21

Amplified Bible

¹⁹Circumcision is nothing, and uncircumcision is nothing, but what matters is keeping the commandments of God. ²⁰Each one should remain in the condition in which he was [when he was] called.

²¹Were you a slave when you were called? Do not worry about that [since your status as a believer is ^[a]equal to that of a freeborn believer]; but if you are able to gain your freedom, ^[b]do that.

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Footnotes

1 Corinthians 7:21 In practice, even if both a slave and his master became Christians, the slave would remain so unless he were freed (cf Onesimus and Philemon); he could not claim that his freedom in Christ applied to his civil status as a slave. But it would have been wrong for others to treat a slave differently from anyone else in church services.
1 Corinthians 7:21 This essentially is an exception to the rule of v 20.