Sacred book of Islam (5)
I believe the answer is:
koran
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sacred book of islam</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for koran that I've seen before include "The Muslim Scriptures in Arabic" , "Islamic sacred book" , "words to prophet" , "Sacred texts of Islam" , "Muslim holy book" .)