Surah 4, Verse 23

Unlawful are your mothers and daughters and your sisters to you, and the sisters of your fathers and your mothers, and the daughters of your brothers and sisters, and foster mothers, foster sisters, and the mothers of your wives, and the daughters of the wives you have slept with who are under your charge; but in case you have not slept with them there is no offence (if you marry their daughters); and the wives of your own begotten sons; and marrying two sisters is unlawful. What happened in the past (is now past): God is forgiving and kind.

— Quran 4:23

Quote from Quran 4:23