But if ye refuse
ma'en  (maw-ane')
to refuse -- refuse, utterly.
and rebel
marah  (maw-raw')
to be (causatively, make) bitter (or unpleasant); (figuratively) to rebel (or resist; causatively, to provoke)
ye shall be devoured
'akal  (aw-kal')
to eat -- at all, burn up, consume, devour(-er, up), dine, eat(-er, up), feed (with), food, freely, in...wise(-deed, plenty), (lay) meat, quite.
with the sword
chereb  (kheh'-reb)
drought; also a cutting instrument (from its destructive effect), as a knife, sword, or other sharp implement -- axe, dagger, knife, mattock, sword, tool.
for the mouth
peh  (peh)
the mouth (as the means of blowing), whether literal or figurative (particularly speech); specifically edge, portion or side; adverbially (with preposition) according to
of the LORD
Yhovah  (yeh-ho-vaw')
(the) self-Existent or Eternal; Jehovah, Jewish national name of God -- Jehovah, the Lord.
hath spoken
dabar  (daw-bar')
perhaps properly, to arrange; but used figuratively (of words), to speak; rarely (in a destructive sense) to subdue