"On the day of (the battle of) Al-Ahzab, Sa'd bin Mu'adh was struck by an arrow such that the upper vein or lower vein of his forearm was severed. So the Messenger of Allah ﷺ tried to stop it with fire, but it made his arm bleed profusely so he left it. Then he did it another time but it caused it to bleed profusely. Upon seeing that he said: 'O Allah! Do not allow my soul depart until my eyes are comforted by elimination of Banu Quraizah.' He pressed his vein closed and it did not bleed a drop before they surrendered to the arbitration of Sa'd bin Mu'adh. He (the Prophet ﷺ) sent to him (Sa'd) who judged that their men should be killed, their women should be spared, and that the Muslims may share them among themselves. With this, the Messenger of Allah ﷺ said: 'You have judged according to Allah's judgement for them.' And they were four hundred. Then when he finished killing them, his vein opened up and he died." [He said:] There are narrations on this topic from Abu Sa'eed and 'Atiyyah Al-Qurazi.  

أَنَّهُ قَالَ رُمِيَ يَوْمَ الأَحْزَابِ سَعْدُ بْنُ مُعَاذٍ فَقَطَعُوا أَكْحَلَهُ أَوْ أَبْجَلَهُ فَحَسَمَهُ رَسُولُ اللَّهِ ﷺ بِالنَّارِ فَانْتَفَخَتْ يَدُهُ فَتَرَكَهُ فَنَزَفَهُ الدَّمُ فَحَسَمَهُ أُخْرَى فَانْتَفَخَتْ يَدُهُ فَلَمَّا رَأَى ذَلِكَ قَالَ اللَّهُمَّ لاَ تُخْرِجْ نَفْسِي حَتَّى تُقِرَّ عَيْنِي مِنْ بَنِي قُرَيْظَةَ فَاسْتَمْسَكَ عِرْقُهُ فَمَا قَطَرَ قَطْرَةً حَتَّى نَزَلُوا عَلَى حُكْمِ سَعْدِ بْنِ مُعَاذٍ فَأَرْسَلَ إِلَيْهِ فَحَكَمَ أَنْ يُقْتَلَ رِجَالُهُمْ وَيُسْتَحْيَى نِسَاؤُهُمْ يَسْتَعِينُ بِهِنَّ الْمُسْلِمُونَ فَقَالَ رَسُولُ اللَّهِ ﷺ أَصَبْتَ حُكْمَ اللَّهِ فِيهِمْ وَكَانُوا أَرْبَعَمِائَةٍ فَلَمَّا فَرَغَ مِنْ قَتْلِهِمُ انْفَتَقَ عِرْقُهُ فَمَاتَ قَالَ وَفِي الْبَابِ عَنْ أَبِي سَعِيدٍ وَعَطِيَّةَ الْقُرَظِيِّ  

That the Messenger of Allah ﷺ said: "Kill the elder men among the idolaters and spare the Sharkh amont them." And the Sharkh are the boys who did not begin to grow pubic hair.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ اقْتُلُوا شُيُوخَ الْمُشْرِكِينَ وَاسْتَحْيُوا شَرْخَهُمْ وَالشَّرْخُ الْغِلْمَانُ الَّذِينَ لَمْ يُنْبِتُوا  

"We were presented to the Messenger of Allah ﷺ on the day of (the battle of) Quraizah. Whoever had pubic hair was killed and whoever did not was left to his way. I was of those who did not have pubic hair so I was left to my way."  

عُرِضْنَا عَلَى النَّبِيِّ ﷺ يَوْمَ قُرَيْظَةَ فَكَانَ مَنْ أَنْبَتَ قُتِلَ وَمَنْ لَمْ يُنْبِتْ خُلِّيَ سَبِيلُهُ فَكُنْتُ مِمَّنْ لَمْ يُنْبِتْ فَخُلِّيَ سَبِيلِي