I am not sure what is meant by new revelation. I do know that many preachers, especially southern preachers, defended salvery using scripture. Paul did not condemn it. So, I am wondering, was it a new revelation when pastors and others began denouncing slavery and favoring it abolishment? Just curious where something like this fits into this thread.
No where does Paul say that we must have slaves. Paul did not condemn it because it was a cultural practice that God Himself did not condemn but it was a totally different form of slavery than we have today. Remember, most slaves were men or women who owed something to the slave owner and worked off their debt. Every 7 years, the slaves would be released. It was not an "ownership" situation like we know slavery today.