A very good explanation by Graeme Wood about the Outlook and thinking of the ISIS. It's a bit long for this generation, but well worth the read. Sobering to think my family would be sold in slavery by these people and my wife and I put to death.
In October, Dabiq, the magazine of the Islamic State, published “The Revival of Slavery Before the Hour,” an article that took up the question of whether Yazidis (the members of an ancient Kurdish sect that borrows elements of Islam, and had come under attack from Islamic State forces in northern Iraq) are lapsed Muslims, and therefore marked for death, or merely pagans and therefore fair game for enslavement. A study group of Islamic State scholars had convened, on government orders, to resolve this issue. If they are pagans, the article’s anonymous author wrote,
Yazidi women and children [are to be] divided according to the Shariah amongst the fighters of the Islamic State who participated in the Sinjar operations [in northern Iraq] … Enslaving the families of the kuffar [infidels] and taking their women as concubines is a firmly established aspect of the Shariah that if one were to deny or mock, he would be denying or mocking the verses of the Koran and the narrations of the Prophet … and thereby apostatizing from Islam.
Of course Michael Totten is always a recommanded read as well http://www.worldaffairsjournal.org/blog/michael-j-totten/too-little-too-late-syria