Hadith 1749
وَعَنِ الْبُخَارِيِّ تَعْلِيقًا قَالَ: لَمَّا مَاتَ الْحَسَنُ بن الْحسن بن عَليّ ضَرَبَتِ امْرَأَتُهُ الْقُبَّةَ عَلَى قَبْرِهِ سَنَةً ثُمَّ رَفَعَتْ فَسَمِعَتْ صَائِحًا يَقُولُ: أَلَا هَلْ وَجَدُوا مَا فَقَدُوا؟ فَأَجَابَهُ آخَرُ: بَلْ يَئِسُوا فَانْقَلَبُوا
Bukhari said without a full isnad that when al-Hasan b. ‘Ali died, his wife put a tent over his grave for a year; then when she removed it she heard one shouting and saying, “Have they found what they lost?” and another replied, “No, they have given up hope and gone away.”