I prophesied a majority? Not quite (4)
I believe the answer is:
amos
'i prophesied' is the definition.
(Amos is a biblical prophet)
'a majority? not quite' is the wordplay.
'majority?' becomes 'most' (most of a group).
'not quite' means to remove the last letter.
'most' with its last letter removed is 'mos'.
'a'+'mos'='AMOS'
(Other definitions for amos that I've seen before include "30th OT book" , "Old Testament book" , "Part of bible" , "Biblical character" , "Hebrew prophet" .)