Al-Ahzab 33:55
لَّا جُنَاحَ عَلَيْهِنَّ فِىٓ ءَابَآئِهِنَّ وَلَآ أَبْنَآئِهِنَّ وَلَآ إِخْوَٰنِهِنَّ وَلَآ أَبْنَآءِ إِخْوَٰنِهِنَّ وَلَآ أَبْنَآءِ أَخَوَٰتِهِنَّ وَلَا نِسَآئِهِنَّ وَلَا مَا مَلَكَتْ أَيْمَـٰنُهُنَّ ۗ وَٱتَّقِينَ ٱللَّهَ ۚ إِنَّ ٱللَّهَ كَانَ عَلَىٰ كُلِّ شَىْءٍ شَهِيدًا
La junaha AAalayhinna fee aba-ihinnawala abna-ihinna wala ikhwanihinnawala abna-i ikhwanihinna wala abna-iakhawatihinna wala nisa-ihinna wala mamalakat aymanuhunna wattaqeena Allaha innaAllaha kana AAala kulli shay-in shaheeda
There is no blame upon them [i.e., women] concerning their fathers or their sons or their brothers or their brothers' sons or their sisters' sons or their women or those their right hands possess [i.e., slaves]. And fear Allāh. Indeed Allāh is ever, over all things, Witness.
There is no sin for them (the wives of the Prophet) in (appearing without Hijāb before) their fathers, or their brothers, or the sons of their brothers, or the sons of their sisters, or their own (Muslim) women, or their slave-girls. And (O wives of the Prophet,) fear Allah. Surely, Allah is witness to every thing.