Ан-Нур 24:32

Islam clearly approves of married life for both men and women. In case certain persons remain unmarried, due to lack of resources, it is necessary that all the members of society unanimously view it as a common problem and do not rest content until it is solved. In the period when Islam came into existence, the system of owning slaves was prevalent in Arabia and, indeed, throughout the whole world. Islam, following its basic principles, started abolishing slavery in a very systematic though gradual manner. One of the methods followed was known as makatibah. The literal meaning of kitab or makatibah is ‘writing’. Here this term denotes a bond by which a male or female slave promises his or her owner to earn for him a specified amount within stipulated time, after which he or she will be free. Both male and female slaves were thus being set free either by makatibah or by other methods, so much so, that by the end of the period of early Islamic history (the period of the ‘four rightly guided caliphs’) the institution of slavery had been almost completely abolished. In pre-Islamic times and even in the very early period of Islam, there were people who used to make their slave girls work as prostitutes. Abdullah ibn Ubayy had many slave girls whom he forced into prostitution and thus earned a profit out of them. When one of these slave girls embraced Islam and wanted to give up prostitution, Abdullah ibn Ubayy started harassing her. Ultimately, at the behest of the Prophet Muhammad, she was freed from his clutches by paying for her freedom.