And whoever of you have not the means wherewith to wed free , believing women , they may wed believing girls from among those ( captives and slaves ) whom your right hands possess , and Allah has full knowledge about your Faith , you are one from another . Wed them with the permission of their own folk ( guardians , Auliya ' or masters ) and give them their Mahr according to what is reasonable ; they ( the above said captive and slave-girls ) should be chaste , not adulterous , nor taking boy-friends .