Sunan an-Nasa'i 3542
سنن النسائي#3542Sahihأَخْبَرَنَا الْعَبَّاسُ بْنُ مُحَمَّدٍ، - هُوَ الدُّورِيُّ - قَالَ حَدَّثَنَا الأَسْوَدُ بْنُ عَامِرٍ، عَنْ زَائِدَةَ، عَنْ هِشَامٍ، عَنْ حَفْصَةَ، عَنْ أُمِّ عَطِيَّةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم أَنَّهُ رَخَّصَ لِلْمُتَوَفَّى عَنْهَا عِنْدَ طُهْرِهَا فِي الْقُسْطِ وَالأَظْفَارِ .
It was narrated from Hafsah, from Umm 'Atiyyah, from the Prophet, that he granted a concession to the woman whose husband has died, allowing her to use Qust and Azfar when purifying herself following her menses
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 27:156