Is there a legal text in the Holy Quran that prohibits the ownership of slaves, and what is the precise meaning of "wa ma malakat aymanukum" (what your right hands possess)?

There is no religious text that prohibits owning slaves. However, Islam encouraged and incentivized the emancipation of slaves, making it an expiation for various sins. There are no bondwomen or slaves in this era except as a result of Islamic conquests and and wars.