It was narrated that Bara’ said:
“We were with the Messenger of Allah ﷺ at a funeral, and he sat at the edge of the grave weeping, until the ground became wet. Then he said: ‘O my brothers, prepare yourselves for something like this.’”

حَدَّثَنَا الْقَاسِمُ بْنُ زَكَرِيَّا بْنِ دِينَارٍ، حَدَّثَنَا إِسْحَاقُ بْنُ مَنْصُورٍ، حَدَّثَنَا أَبُو رَجَاءٍ الْخُرَاسَانِيُّ، عَنْ مُحَمَّدِ بْنِ مَالِكٍ، عَنِ الْبَرَاءِ، قَالَ كُنَّا مَعَ رَسُولِ اللَّهِ ـ ﷺ ـ فِي جِنَازَةٍ فَجَلَسَ عَلَى شَفِيرِ الْقَبْرِ فَبَكَى حَتَّى بَلَّ الثَّرَى ثُمَّ قَالَ " يَا إِخْوَانِي لِمِثْلِ هَذَا فَأَعِدُّوا " .