“Indeed, the penalty for those who wage war against Allah and His Messenger and strive upon earth [to cause] corruption is none but that they be killed or crucified or that their hands and feet be cut off from opposite sides or that they be exiled from the land. That is for them a disgrace in this world; and for them in the Hereafter is a great punishment.” (Qur’an 5:33)
“Then they [the Jewish Qurayzah tribe] surrendered, and the apostle [Muhammad] confined them in Medina in the quarter of d. al-Harith, a woman of B. Al-Najjar. Then the apostle went out to the market of Medina (which is still its market today) and dug trenches in it. Then he sent for them and struck off their heads in those trenches as they were brought out to him in batches. Among them was the enemy of Allah Huyayy b. Akhtab and Ka’b b. Asad their chief. There were 600 or 700 in all, though some put the figure as high as 800 or 900.” — Ibn Ishaq 690
Muhammad beheaded the Qurayzah men because he considered them to have betrayed him and effectively revolted against his rule. So the Islamic State here is following Muhammad’s example quite closely.
“Syria tribal revolt against Islamic State ignored, fueling resentment,” by Liz Sly, Washington Post, October 20, 2014:
REYHANLI, Turkey — The cost of turning against the Islamic State was made brutally apparent in the streets of a dusty backwater town in eastern Syria in early August. Over a three-day period, vengeful fighters shelled, beheaded, crucified and shot hundreds of members of the Shaitat tribe after they dared to rise up against the extremists.
By the time the killing stopped, 700 people were dead, activists and survivors say, making this the bloodiest single atrocity committed by the Islamic State in Syria since it declared its existence 18 months ago.
The little-publicized story of this failed tribal revolt in Abu Hamam, in Syria’s eastern Deir al-Zour province, illuminates the challenges that will confront efforts to persuade those living under Islamic State rule — in Iraq as well as Syria — to join the fight against the jihadist group, something U.S. officials say is essential if the campaign against the militants is to succeed.
The Abu Hamam area has now been abandoned, and many of the bodies remain uncollected, offering a chilling reminder to residents elsewhere of the fate that awaits those who dare rebel.
Just as powerful a message for those living under the militants’ iron fist was the almost complete international silence on the bloodbath.…
“We saw what the Americans did to help the Yazidis and the Kurds. But they have done nothing to help the Sunnis against the Islamic State,” he said.
Abu Salem and the other men said they did not so much begrudge the efforts to help Kurds as wonder why no one had helped them when their community was under attack. The carnage inflicted on the Shaitat tribe has instilled in the Abu Hamam survivors a loathing for the Islamic State and the warped brand of Islamist politics for which it stands, said Abu Siraj, another of the tribesmen. A former lawyer, he, like most of the men, asked to be identified only by his nom de guerre because he fears being tracked even to Turkey by the jihadists.
“Now we hate everyone who prays,” he said. “Now we hate even beards.”
Abu Salem apparently subscribes to the Islamophobic idea that the Islamic State has something to do with Islam.