Africans were for thousands of years the biggest exporter of slaves in history mostly to the middle east a practice that still continues to this day. Muslims whether it be arabs are turks were big into slavery, even enslaving white people. Arabs and turks took more African slaves than anyone else, usually men and unlike in the Americas these men were castrated like they do with cattle so they'd be more docile and obedient eunuchs. Turks stole a lot of Christian boys from their parents to brainwash and train to become elite jannasaries soldiers, one of these soldiers a Greek was the famous architect Mimar Sinan who along with other Greeks built most of the great buildings & mosques in the ottoman and Arab world from Süleymaniye Mosque in constantinople to the taj mahal in India.
Anyway owning slaves means someone to work your land, do your chores, make you money, have sexual relations with and even bear children for you.
Often what i notice about people is that when it comes to morality of right vs wrong it comes down to what's legal & what's ilegal. Even in the United States self appointed world morality police there are giant monuments to slave owners, yet these founding fathers declared all men equal and free.