Also try to figure out why would the current derogatory term for slaves in South Africa have its origin in the word meaning "the unbeliever" in Arabic, i.e. one who's not an adherent of certain religion, as used in their religious texts:

https://en.wikipedia.org/wiki/Kaffir_(racial_term)#Etymology

Or that it wasn't an accident that the founder of the said religion, the eternal "role model", was a slaveowner himself.