The Messenger of Allah ﷺ visited his mother's grave and wept and cause those around him to weep. The Messenger of Allah ﷺ then said: I asked my Lord's permission to pray for forgiveness for her, but I was not allowed. I then asked His permission to visit her grave, and I was allowed. So visit graves, for they make one mindful of death.

أَتَى رَسُولُ اللَّهِ ﷺ قَبْرَ أُمِّهِ فَبَكَى وَأَبْكَى مَنْ حَوْلَهُ فَقَالَ رَسُولُ اللَّهِ ﷺ اسْتَأْذَنْتُ رَبِّي تَعَالَى عَلَى أَنْ أَسْتَغْفِرَ لَهَا فَلَمْ يُؤْذَنْ لِي فَاسْتَأْذَنْتُ أَنْ أَزُورَ قَبْرَهَا فَأُذِنَ لِي فَزُورُوا الْقُبُورَ فَإِنَّهَا تُذَكِّرُ بِالْمَوْتِ

The Messenger of Allah ﷺ said: "I had forbidden you from visiting graves, so visit them, for in visiting them there is a reminder."

قَالَ رَسُولُ اللَّهِ ﷺ: «نَهَيْتُكُمْ عَنْ زِيَارَةِ الْقُبُورِ، فَزُورُوهَا؛ فَإِنَّ فِي زِيَارَتِهَا تَذْكِرَةً.»