Surah An-Nisa, ayah 23

حُرِّمَتۡ عَلَيۡكُمۡ أُمَّهَٰتُكُمۡ وَبَنَاتُكُمۡ وَأَخَوَٰتُكُمۡ وَعَمَّٰتُكُمۡ وَخَٰلَٰتُكُمۡ وَبَنَاتُ ٱلۡأَخِ وَبَنَاتُ ٱلۡأُخۡتِ وَأُمَّهَٰتُكُمُ ٱلَّٰتِيٓ أَرۡضَعۡنَكُمۡ وَأَخَوَٰتُكُم مِّنَ ٱلرَّضَٰعَةِ وَأُمَّهَٰتُ نِسَآئِكُمۡ وَرَبَٰٓئِبُكُمُ ٱلَّٰتِي فِي حُجُورِكُم مِّن نِّسَآئِكُمُ ٱلَّٰتِي دَخَلۡتُم بِهِنَّ فَإِن لَّمۡ تَكُونُواْ دَخَلۡتُم بِهِنَّ فَلَا جُنَاحَ عَلَيۡكُمۡ وَحَلَٰٓئِلُ أَبۡنَآئِكُمُ ٱلَّذِينَ مِنۡ أَصۡلَٰبِكُمۡ وَأَن تَجۡمَعُواْ بَيۡنَ ٱلۡأُخۡتَيۡنِ إِلَّا مَا قَدۡ سَلَفَۗ إِنَّ ٱللَّهَ كَانَ غَفُورٗا رَّحِيمٗا ٢٣

Hurrimat 'alaykum ummahātukum wabanātukum wa akhawātukum wa'ammātukum wakhālātukum wabanātul-akhi wabanātul-ukhti wa ummahātukumul-lātī arda'nakum wa akhawātukum minar-radā'ati wa ummahātu nisā'ikum warabā'ibukumul-lātī fī hujūrikum min nisā'ikumul-lātī dakhaltum bihinna fa il lam takūnū dakhaltum bihinna falā junāha 'alaykum wahalā'ilu abnā'ikumul-ladhīna min aslābikum wa an tajma'ū baynal-ukhtayni illā mā qad salafa innallāha kāna ghafūrar rahīmā

Prohibited to you [for marriage] are your mothers, your daughters, your sisters, your father's sisters, your mother's sisters, your brother's daughters, your sister's daughters, your [milk] mothers who nursed you, your sisters through nursing, your wives' mothers, and your step-daughters under your guardianship [born] of your wives unto whom you have gone in. But if you have not gone in unto them, there is no sin upon you. And [also prohibited are] the wives of your sons who are from your [own] loins, and that you take [in marriage] two sisters simultaneously, except for what has already occurred.¹⁷⁶ Indeed, Allāh is ever Forgiving and Merciful.