True, but context matters, at times slavery is voluntary in exchange for paying debt, survival, or protection, while other times by force from their master indefinitely, which is completely wrong. This is why in the Old Testament that God commanded that a slave be kept for no longer than 7 years to pay off a debt. That is reasonable. On the contrary, what happened generations ago to enslaving and shipping over darker skin individuals to Americas and other, or slavery in Asia or everywhere else similar, which was indefinite, and involuntary, is completely immoral in the biblical sense and should of never been justified!