[pinkpanther]

Ah Lee, you said the judge was chosen by their own but this passage said it was chosen by Muh!
Pls check your hadiths for answer...I will call you a liar for any inaccuracy 

The Banu Qurayza were besieged for 25 days until they surrendered.[1] The men from Banu Aws, who were one of the two Arab tribes in Medina who had become followers of Muhammad and part of the Ansar, requested that Muhammad treat Banu Qurayza leniently, as they were their client tribe. Muhammad then proposed that one man from the Banu Aws pass the judgment, and they agreed. He then appointed Sa'd ibn Muadh, who was gravely wounded by an arrow. So Sa'd stated that his decision would be, "The men should be killed, the property divided, and the women and children taken as slaves."