Surah An-Nur, ayah 33

وَلۡيَسۡتَعۡفِفِ ٱلَّذِينَ لَا يَجِدُونَ نِكَاحًا حَتَّىٰ يُغۡنِيَهُمُ ٱللَّهُ مِن فَضۡلِهِۦۗ وَٱلَّذِينَ يَبۡتَغُونَ ٱلۡكِتَٰبَ مِمَّا مَلَكَتۡ أَيۡمَٰنُكُمۡ فَكَاتِبُوهُمۡ إِنۡ عَلِمۡتُمۡ فِيهِمۡ خَيۡرٗاۖ وَءَاتُوهُم مِّن مَّالِ ٱللَّهِ ٱلَّذِيٓ ءَاتَىٰكُمۡۚ وَلَا تُكۡرِهُواْ فَتَيَٰتِكُمۡ عَلَى ٱلۡبِغَآءِ إِنۡ أَرَدۡنَ تَحَصُّنٗا لِّتَبۡتَغُواْ عَرَضَ ٱلۡحَيَوٰةِ ٱلدُّنۡيَاۚ وَمَن يُكۡرِههُّنَّ فَإِنَّ ٱللَّهَ مِنۢ بَعۡدِ إِكۡرَٰهِهِنَّ غَفُورٞ رَّحِيمٞ ٣٣

Walyasta'fifil-ladhīna lā yajidūna nikāhan hattā yughniyahumullāhu min fadlihī walladhīna yabtaghūnal-kitāba mimmā malakat aymānukum fakātibūhum in 'alimtum fīhim khayran wa ātūhum mim mālillāhil-ladhī ātākum walā tukrihū fatayātikum 'alal-bighā'i in aradna tahassunal litabtaghū 'aradal-hayawātid-dunyā waman yukrihhunna fa innallāha mim ba'di ikrāhihinna ghafūrur rahīm

But let them who find not [the means for] marriage abstain [from sexual relations] until Allāh enriches them from His bounty. And those who seek a contract [for eventual emancipation] from among whom your right hands possess⁹⁹⁴ - then make a contract with them if you know there is within them goodness and give them from the wealth of Allāh which He has given you. And do not compel your slave girls to prostitution, if they desire chastity, to seek [thereby] the temporary interests of worldly life. And if someone should compel them, then indeed, Allāh is [to them], after their compulsion, Forgiving and Merciful.