This is a video of ISIS fighters calling Jabhat Al Nusrah Murtadeen and saying that Shaykh Al Jawlani is a lying murtad and shaykh Abu Marriyah is a murtad pig.
The video is in Arabic but anyone with even the most basic understanding of Arabic should be able to make out what these takfeeris are saying:
This kind of takfeer is extremely common amongst their fighters, another example being this comment by one of them on twitter a few days back:
and what is more, we reported that on 6th November ISIS LEADERS rejected peace with Jabhat Al Nusrah saying that they where Murtadeen:
By the Grace of Allah the mask is slipping and the extremism of this group is becoming more apparent for sincere brothers and sisters to see.