“The Islamic State’s sex trade appears to be based solely on enslaving women and girls from the Yazidi minority. As yet, there has been no widespread campaign aimed at enslaving women from other religious minorities, said Samer Muscati, the author of the recent Human Rights Watch report.”

In the moments before he raped the 12-year-old girl, the Islamic State fighter took the time to explain that what he was about to do was not a sin. Because the preteen girl practiced a religion other than Islam, the Quran not only gave him the right to rape her — it condoned and encouraged it, he insisted.

He bound her hands and gagged her. Then he knelt beside the bed and prostrated himself in prayer before getting on top of her.

When it was over, he knelt to pray again, bookending the rape with acts of religious devotion.

“I kept telling him it hurts — please stop,” said the girl, whose body is so small an adult could circle her waist with two hands. “He told me that according to Islam he is allowed to rape an unbeliever. He said that by raping me, he is drawing closer to God,” she said in an interview alongside her family in a refugee camp here, to which she escaped after 11 months of captivity.

The systematic rape of women and girls from the Yazidi religious minority has become deeply enmeshed in the organization and the radical theology of the Islamic State in the year since the group announced it was reviving slavery as an institution. Interviews with 21 women and girls who recently escaped the Islamic State, as well as an examination of the group’s official communications, illuminate how the practice has been enshrined in the group’s core tenets.

The trade in Yazidi women and girls has created a persistent infrastructure, with a network of warehouses where the victims are held, viewing rooms where they are inspected and marketed, and a dedicated fleet of buses used to transport them.

A total of 5,270 Yazidis were abducted last year, and at least 3,144 are still being held, according to community leaders. To handle them, the Islamic State has developed a detailed bureaucracy of sex slavery, including sales contracts notarized by the ISIS-run Islamic courts. And the practice has become an established recruiting tool to lure men from deeply conservative Muslim societies, where casual sex is taboo and dating is forbidden.

A growing body of internal policy memos and theological discussions has established guidelines for slavery, including a lengthy how-to manual issued by the Islamic State Research and Fatwa Department just last month. Repeatedly, the ISIS leadership has emphasized a narrow and selective reading of the Quran and other religious rulings to not only justify violence, but also to elevate and celebrate each sexual assault as spiritually beneficial, even virtuous.

“Every time that he came to rape me, he would pray,” said F, a 15-year-old girl who was captured on the shoulder of Mount Sinjar one year ago and was sold to an Iraqi fighter in his 20s. Like some others interviewed by The New York Times, she wanted to be identified only by her first initial because of the shame associated with rape.

“He kept telling me this is ibadah,” she said, using a term from Islamic scripture meaning worship.

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