Surah An-Nisa, ayah 24

۞ وَٱلۡمُحۡصَنَٰتُ مِنَ ٱلنِّسَآءِ إِلَّا مَا مَلَكَتۡ أَيۡمَٰنُكُمۡۖ كِتَٰبَ ٱللَّهِ عَلَيۡكُمۡۚ وَأُحِلَّ لَكُم مَّا وَرَآءَ ذَٰلِكُمۡ أَن تَبۡتَغُواْ بِأَمۡوَٰلِكُم مُّحۡصِنِينَ غَيۡرَ مُسَٰفِحِينَۚ فَمَا ٱسۡتَمۡتَعۡتُم بِهِۦ مِنۡهُنَّ فَـَٔاتُوهُنَّ أُجُورَهُنَّ فَرِيضَةٗۚ وَلَا جُنَاحَ عَلَيۡكُمۡ فِيمَا تَرَٰضَيۡتُم بِهِۦ مِنۢ بَعۡدِ ٱلۡفَرِيضَةِۚ إِنَّ ٱللَّهَ كَانَ عَلِيمًا حَكِيمٗا ٢٤

Wal-muhsanātu minan-nisā'i illā mā malakat aymānukum kitāballāhi 'alaykum wa uhilla lakum mā warā'a dhālikum an tabtaghū bi amwālikum muhsinīna ghayra musāfihīna famastamta'tum bihī minhunna fa'ātūhunna ujūrahunna farīdatan walā junāha 'alaykum fīmā tarādaytum bihī mim ba'dil-farīdati innallāha kāna 'alīman hakīmā

And [also prohibited to you are all] married women except those your right hands possess.¹⁷⁷ [This is] the decree of Allāh upon you. And lawful to you are [all others] beyond these, [provided] that you seek them [in marriage] with [gifts from] your property, desiring chastity, not unlawful sexual intercourse. So for whatever you enjoy [of marriage] from them, give them their due compensation¹⁷⁸ as an obligation. And there is no blame upon you for what you mutually agree to beyond the obligation. Indeed, Allāh is ever Knowing and Wise.