How much more clear can it get? There is no commandment that says “Thou shalt not own another human being as property”. Owning a slave is not a sin. Exodus 21 tells you where to buy slaves, how long you can keep them for, how you can treat them, etc. Anybody who tries to twist the meaning of this knows it is immoral to own slaves and wants to falsely defend the Bible. For example, there is absolutely no mention of the words “indentured servitude” in the Bible, but apologist will swear that is what it means. In any case, that is STILL owning another human being as property. It doesn’t matter if they were treated nice or were let go after some years…slavery is slavery no matter how much you try to sugarcoat it. The laws governing non-Hebrew slaves were more harsh than those governing Hebrew slaves: non-Hebrew slaves could be owned permanently, and bequeathed to the owner's children, whereas Hebrew slaves were treated as servants, and were released after six years of service or the occurrence of a jubilee year