Egyptian Journalist on IS's Atrocities (video)

Noted the Israeli Arabist scholar Mordechai Kedar in an important analysis of the meaning and motivation of the horrible death of Moaz al-Kasasbeh:

'[T]he burning alive of the Jordanian pilot is not a new propaganda weapon invented by ISIS, as some of the media commentators on the movie claimed. This is a method of eliminating enemies that is well known and documented in early Islamic sources, and based on a deductive legal principle in Sharia law.'

Below, in a video from the invaluable Memri.org, is Egyptian journalist and TV host Ibrahim Eissa insisting on 3 February that IS's atrocities are rooted in Islamic sources:

(https://www.youtube.com/watch?v=VaHaWta7AFI)