'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."  

أَنَّهُ أَخْبَرَهُ قَالَ كُنْتُ فِي سَبْىِ قُرَيْظَةَ وَكَانَ يُنْظَرُ فَمَنْ خَرَجَ شِعْرَتُهُ قُتِلَ وَمَنْ لَمْ تَخْرُجِ اسْتُحْيِيَ وَلَمْ يُقْتَلْ