He said the young women, mostly Yazidi and Christian, are handed to fighters who act as informants against disloyal Daesh defectors before being sold at slave markets in Raqqa for a between £200 ($250) and £500 ($550).
Abu Al-Mughaira Al-Muhajer said: “Whenever they took captives, they would bring slave girls, and they would place them on the slave market in Raqqa.
ISIS fighters are given brutalised sex slaves as a reward for exposing defectors
“Afterwards, they would sell them for dollars.
“Their price would range from $250 to $550.
“The Islamic State would buy slave girls and give them as rewards.”
The captured jihadi says the girls are mostly Christian and Yazidi
Sex slaves are traded on WhatsApp for hundreds of pounds by ISIS fanatics
He added: “After I informed on my brother, who wanted to leave ISIS, I was rewarded with three slave girls - one from Damascus and two from Homs.
“All of them had been beaten on their backs.
“They told me that the girl from Damascus was a Yazidi and that the two girls from Homs were Christians.