Αυθεντικό κείμενο - Αραβικά - La Illah Illallah, Mohammed rasul...

I'm not sure if it's arabic, but I think it is. It's from the song Seif Al Din, from Epica.
Here is a link to the song lyrics -->http://www.lyrics007.com/Epica%20Lyrics/Seif%20al%20din%20Lyrics.html. I don't know nothing about that language, and that is why I'm not if it is really arabic.