Khawaarij [Terrorists of the Era Daa’ish]-Perpetrators of Mighty Evils In The Name of Piety
Shaikh Abu Fareehaan Jamaal al-Haarithee (may Allaah preserve him) said:
Have you not seen that after their splitting [i.e. Khawaarij—Terrorists (ISIS, An-Nusrah and Daa-ish)] between themselves, they declared one another disbelievers and fought one another. Have you not seen that the Muslims are (now) frightened of these ones (i.e. this group of khawaarij) and those ones (i.e. that other group of khawaarij), and they do not know who among them is upon truth!?
Source: http://www.sahab.net/forums/index.php?showtopic=145177 paraphrased