Casting the first stone

Apropos "Quran and sex slaves", http://magree.blogspot.com/2016/06/quran-and-sex-slaves.html

Given that Muslims call Christians and Jews people of the Book. shouldn’t Muslims also heed the the words of Jesus?  Especially when it comes to punishing others: “He that is without sin among you, let him first cast a stone at her.” - John: 8:7

This would apply equally to ISIS punishing others for their beliefs and punishing ISIS for its adultery.

Too bad ISIS and its ilk won’t “go and sin no more”.