Mambo Ya Walawi 25:44

“ ‘Watumwa wako wa kiume na wa kike watatoka katika mataifa yanayokuzunguka; kutoka kwao waweza kununua watumwa.

Both thy bondmen, and thy bondmaids, which thou shalt have, shall be of the heathen that are round about you; of them shall ye buy bondmen and bondmaids.