For though thy people
`am (am)
a people (as a congregated unit); specifically, a tribe (as those of Israel); hence (collectively) troops or attendants; figuratively, a flock -- folk, men, nation, people.
Israel
Yisra'el (yis-raw-ale')
he will rule as God; Jisrael, a symbolical name of Jacob; also (typically) of his posterity: --Israel.
be as the sand
chowl (khole)
sand (as round or whirling particles) -- sand.
of the sea
yam (yawm)
from an unused root meaning to roar -- sea (-faring man, (-shore), south, west (-ern, side, -ward).
yet a remnant
sh'ar (sheh-awr')
a remainder -- other, remnant, residue, rest.
of them shall return
shuwb (shoob)
to turn back (hence, away) transitively or intransitively, literally or figuratively
the consumption
killayown (kil-law-yone')
pining, destruction -- consumption, failing.
decreed
charats (khaw-rats')
to point sharply, i.e. (literally) to wound; figuratively, to be alert, to decide -- bestir self, decide, decree, determine, maim, move.
shall overflow
shataph (shaw-taf')
to gush; by implication, to inundate, cleanse; by analogy, to gallop, conquer -- drown, (over-)flow(-whelm, rinse, run, rush, (throughly) wash (away).
with righteousness
tsdaqah (tsed-aw-kaw')
rightness (abstractly), subjectively (rectitude), objectively (justice), morally (virtue) or figuratively (prosperity) -- justice, moderately, right(-eous) (act, -ly, -ness).