Is it permissible for a free man to marry a female slave?
(Part No. 18; Page No. 328)
It is permissible for a Muslim free man to marry a Muslim female salve if he cannot afford the dowry for marrying a free woman or the money for buying a female slave. This is even stressed when he faces the hardship of remaining single due to inability to satisfy his sexual desire or his need of someone to take care of him if he is old, ill or the like. This is regardless of whether his current free wife is too young, away or ill. The basic principle in this regard is the saying of Allah (Exalted be He),
And whoever of you have not the means wherewith to wed free, believing women, they may wed believing girls from among those (slaves) whom your right hands possess
May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.