People in the Pre-Islamic era of ignorance used to force their slave girls into prostitution and Fornication (i.e., illicit sexual intercourse), and take their earnings, and therefore Allah, Exalted is He, revealed the ayah that reads (what means): {And do not compel your slave girls to prostitution, if they desire chastity, to seek [thereby] the temporary interests of worldly life.} [Quran 24:33]. In this hadeeth, the Prophet ﷺ forbade the earnings of female slaves from prostitution, and this aims to protect the female slaves from being forced into Fornication. It also aims to protect them from unlawful earnings and all base qualities and inferior ways of earning a living..