A book of the Bible - or a 1977 album by Bob Marley & the Wailers (6)

I believe the answer is:

exodus

(Other definitions for exodus that I've seen before include "Old Testament Book 2" , "Mass leaving" , "A mass departure, as in 2nd book of Old Testament" , "Biblical book - going out" , "OT book - flight" .)

I've seen this clue in The Guardian.

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