Bible books exist to be raised as a source of inspiration (5)
I believe the answer is:
erato
'a source of inspiration' is the definition.
(one of the muses in Greek myth)
'bible books exist to be raised' is the wordplay.
'bible books' becomes 'OT' (Old Testament).
'exist' becomes 'are' ('they exist' means 'they are').
'to be raised' says the letters should be written in reverse (going up in a down clue).
'ot'+'are'='otare'
'otare' reversed gives 'ERATO'.
'as' acts as a link.
(Other definitions for erato that I've seen before include "poetical inspiration" , "inspiration for poetry" , "Poet's inspiration" , "Greek muse - orate (anag)" , "verses she inspired" .)