And the light
'owr  (ore)
illumination or (concrete) luminary (in every sense, including lightning, happiness, etc.) -- bright, clear, + day, light (-ning), morning, sun.
of Israel
Yisra'el  (yis-raw-ale')
he will rule as God; Jisrael, a symbolical name of Jacob; also (typically) of his posterity: --Israel.
shall be for a fire
'esh  (aysh)
fire -- burning, fiery, fire, flaming, hot.
and his Holy One
qadowsh  (kaw-doshe')
sacred (ceremonially or morally); (as noun) God (by eminence), an angel, a saint, a sanctuary -- holy (One), saint.
for a flame
lehabah  (leh-aw-baw')
flame(-ming), head (of a spear).
and it shall burn
ba`ar  (baw-ar')
to kindle, i.e. consume (by fire or by eating); also to be(-come) brutish
and devour
'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.
his thorns
shayith  (shah'-yith)
scrub or trash, i.e. wild growth of weeds or briers (as if put on the field) -- thorns.
and his briers
shamiyr  (shaw-meer')
a thorn; also (from its keenness for scratching) a gem, probably the diamond -- adamant (stone), brier, diamond.
in one
'echad  (ekh-awd')
united, i.e. one; or (as an ordinal) first
yowm  (yome)
a day (as the warm hours),