An-Nur 24:33 وليستعفف الذين لا يجدون نكاحا حتى يغنيهم الله من فضله والذين يبتغون الكتاب مما ملكت ايمانكم فكاتبوهم ان علمتم فيهم خيرا واتوهم من مال الله الذي اتاكم ولا تكرهوا فتياتكم على البغاء ان اردن تحصنا لتبتغوا عرض الحياة الدنيا ومن يكرههن فان الله من بعد اكراههن غفور رحيم ٣٣

Let those who find not the wherewithal for marriage keep themselves chaste, until Allah gives them means out of His grace. And if any of your slaves ask for a deed in writing (to enable them to earn their freedom for a certain sum), give them such a deed if ye know any good in them: yea, give them something yourselves out of the means which Allah has given to you. But force not your maids to prostitution when they desire chastity, in order that ye may make a gain in the goods of this life. But if anyone compels them, yet, after such compulsion, is Allah, Oft-Forgiving, Most Merciful (to them),