[Machine] There were seventy young men from the Ansar called the Qurrā who used to stay in the mosque. When it was evening, they would go to a area of the city, where they would study and pray. Their families thought they were in the mosque, and the people of the mosque thought they were with their families. When it was almost dawn, they would fetch water and collect firewood, which they would bring to the Prophet's chamber. The Prophet sent them all on a mission, and they were ambushed at the well of Ma'ūnah. The Prophet then prayed against their killers for fifteen days during the morning prayer.  

كَانَ شَبَابٌ مِنَ الْأَنْصَارِ سَبْعِينَ رَجُلًا يُسَمَّوْنَ الْقُرَّاءَ قَالَ كَانُوا يَكُونُونَ فِي الْمَسْجِدِ فَإِذَا أَمْسَوْا انْتَحَوْا نَاحِيَةً مِنَ الْمَدِينَةِ فَيَتَدَارَسُونَ وَيُصَلُّونَ يَحْسِبُ أَهْلُوهُمْ أَنَّهُمْ فِي الْمَسْجِدِ وَيَحْسِبُ أَهْلُ الْمَسْجِدِ أَنَّهُمْ عِنْدَأَهْلِيهِمْ حَتَّى إِذَا كَانُوا فِي وَجْهِ الصُّبْحِ اسْتَعْذَبُوا مِنَ الْمَاءِ وَاحْتَطَبُوا مِنَ الْحَطَبِ فَجَاءُوا بِهِ فَأَسْنَدُوهُ إِلَى حُجْرَةِ رَسُولِ اللهِ ﷺ فَبَعَثَهُمُ النَّبِيُّ ﷺ جَمِيعًا فَأُصِيبُوا يَوْمَ بِئْرِ مَعُونَةَ فَدَعَا النَّبِيُّ ﷺ عَلَى قَتَلَتِهِمْ خَمْسَةَ عَشَرَ يَوْمًا فِي صَلَاةِ الْغَدَاةِ