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

And those who cannot afford marriage should keep themselves chaste until Allah enriches them out of His grace. And those of your slaves who wish to enter the contract of Kitābah (emancipation by paying money), contract Kitābah with them, if you recognize some good in them. And give them out of the wealth of Allah that He has given to you. And do not compel your maids to prostitution - if they wish to observe chastity - in order that you may seek the temporary benefit of the worldly life. If one compels them, then after their being compelled, Allah is Most-Forgiving, Very-Merciful.