'I was among the prisoners of Quraizah; we were examined, and whoever had grown (pubic) hair was killed, and whoever had not grown hair, he was allowed to live and was not killed." (Using translation from Nasāʾī 4981)  

أَنَّهُ أَخْبَرَهُ قَالَ «كُنْتُ فِي سَبْيِ قُرَيْظَةَ وَكَانَ يُنْظَرُ فَمَنْ خَرَجَ شِعْرَتُهُ قُتِلَ وَمَنْ لَمْ يَخْرُجِ اسْتُحْيِيَ وَلَمْ يُقْتَلْ»