{They say} (legousin). Present active of vivid dramatic
action and the indefinite statement in the plural as in  13:16  16:15 . It is possible that the allusion is to the heavenly voice
( 10:4,8 ) and to the angel ( 10:9 ). {Thou must prophesy again}
(dei se palin proph(8874)eusai). Not a new commission ( 1:19 ),
though now renewed. C.f.  Eze 4:7  6:2  Jer 1:10 . The palin
(again) points to what has preceded and also to what is to come
in  11:15 . Here it is predictive prophecy (proph(8874)eusai, first
aorist active infinitive of proph(8874)eu(935c)). {Over} (epi). In the
case, in regard to as in  Joh 12:16  (with graph(935c)), not in the
presence of (epi with genitive,  Mr 13:9 ) nor against (epi
with the accusative,  Lu 22:53 ). For this list of peoples see
 5:9 , occurring seven times in the Apocalypse.