Sahih Muslim 2259

حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ وَزُهَيْرُ بْنُ حَرْبٍ قَالَا حَدَّثَنَا مُحَمَّدُ بْنُ عُبَيْدٍ عَنْ يَزِيدَ بْنِ كَيْسَانَ عَنْ أَبِي حَازِمٍ عَنْ أَبِي هُرَيْرَةَ قَالَ زَارَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَبْرَ أُمِّهِ فَبَكَى وَأَبْكَى مَنْ حَوْلَهُ فَقَالَ اسْتَأْذَنْتُ رَبِّي فِي أَنْ أَسْتَغْفِرَ لَهَا فَلَمْ يُؤْذَنْ لِي وَاسْتَأْذَنْتُهُ فِي أَنْ أَزُورَ قَبْرَهَا فَأُذِنَ لِي فَزُورُوا الْقُبُورَ فَإِنَّهَا تُذَكِّرُ الْمَوْتَ

Abu Huraira reported: The Apostle of Allah ( ‌صلی ‌اللہ ‌علیہ ‌وسلم ‌ ) visited the grave of his mother and he wept, and moved others around him to tears, and said: I sought permission from my Lord to beg forgiveness for her but it was not granted to me, and I sought permission to visit her grave and it was granted to me so visit the graves, for that makes you mindful of death.