"The Messenger of Allah visited the grave of his mother and wept, and caused those around him to weep. He said: 'I asked my Lord for permission to pray for forgiveness for her and He did not give me permission, and I asked Him for permission to visit her grave and He gave me permission, so visit the graves, for they will remind you of death."'  

زَارَ رَسُولُ اللَّهِ ﷺ قَبْرَ أُمِّهِ فَبَكَى وَأَبْكَى مَنْ حَوْلَهُ وَقَالَ اسْتَأْذَنْتُ رَبِّي ﷻ فِي أَنْ أَسْتَغْفِرَ لَهَا فَلَمْ يُؤْذَنْ لِي وَاسْتَأْذَنْتُ فِي أَنْ أَزُورَ قَبْرَهَا فَأَذِنَ لِي فَزُورُوا الْقُبُورَ فَإِنَّهَا تُذَكِّرُكُمُ الْمَوْتَ