MUSLIM 956:
from Abū Hurayrah —
Lead me to her (or his) grave. They led him to that place and he said prayer over her (or him) and then remarked: Verily, these graves are full of darkness for their dwellers. Verily, the Mighty and Glorious Allah illuminates them for their occupants by reason of my prayer over them.
مسلم ٩٥٦:
عن ابو هريره —
أَنَّ امْرَأَةً سَوْدَاءَ كَانَتْ تَقُمُّ الْمَسْجِدَ أَوْ شَابًّا فَفَقَدَهَا رَسُولُ اللَّهِ ﷺ فَسَأَلَ عَنْهَا أَوْ عَنْهُ فَقَالُوا مَاتَ قَالَ أَفَلاَ كُنْتُمْ آذَنْتُمُونِي قَالَ فَكَأَنَّهُمْ صَغَّرُوا أَمْرَهَا أَوْ أَمْرَهُ فَقَالَ دُلُّونِي عَلَى قَبْرِهِ فَدَلُّوهُ فَصَلَّى عَلَيْهَا ثُمَّ قَالَ إِنَّ هَذِهِ الْقُبُورَ مَمْلُوءَةٌ ظُلْمَةً عَلَى أَهْلِهَا وَإِنَّ اللَّهَ ﷻ يُنَوِّرُهَا لَهُمْ بِصَلاَتِي عَلَيْهِمْ