This is a verse from 1st Timothy 1: 9-10.We also know that the law is made not for the righteous but for lawbreakers and rebels, the ungodly and sinful, the unholy and irreligious, for those who kill their fathers or mothers, for murderers, 10 for the sexually immoral, for those practicing homosexuality, for slave traders and liars and perjurers—and for whatever else is contrary to the sound doctrine. So, it explicitly stated here that slave traders go against the "sound doctrine." Yes, this is technically the only verse in the Bible that goes against slavery, and there are many Bible verses saying for slaves to treate their masters with respect, and for masters to treat their slaves well. There is even a Bible verse where Paul tells some slave master to treat his slave like a brother in Christ. In the New Testament, there are versus saying for slaves to treat their masters well as to provide a good example in Christ. Slavery is also used as a metaphor throughout the New Testament as a slave in Christ. Well, I never said that God said it was o.k. to keep slaves to keep the Jewish morality in check. Here is an interesting essay for the reason why the Old Testament allowed for the owning of other people as property: https://www.compellingtruth.org/slavery-Old-Testament.html. Also, after you read some of this article, and you ask yourself, "If God exists, then why don't we live in a perfect world?" I would respond by telling you to read about the fall of man in the Old Testament. Before you ask why God allowed Adam and Eve to be tempted by the Devil, I would tell you because God created free will. WE are all free to do whatever we want, and if God had to stop everything that was wrong about man and angels, then man and angels would just be like robots, biological robots under complete and utter control. Sorry it took so long to respond, but I just didn't feel like continuing a debate yesterday and the day before yesterday, I have been debating too much on this website.