For they shall soon
mherah (meh-hay-raw')
a hurry; hence (adverbially) promptly -- hastily, quickly, shortly, soon, make (with) speed(-ily), swiftly.
be cut down
namal (naw-mal')
to become clipped or (specifically) circumcised -- (branch to) be cut down (off), circumcise.
like the grass
chatsiyr (khaw-tseer')
grass; also a leek (collectively) -- grass, hay, herb, leek.
and wither
nabel (naw-bale')
to wilt; generally, to fall away, fail, faint; figuratively, to be foolish or (morally) wicked; causatively, to despise, disgrace
as the green
yereq (yeh'-rek)
pallor, i.e. hence, the yellowish green of young and sickly vegetation; concretely, verdure, i.e. grass or vegetation -- grass, green (thing).
herb
deshe' (deh'-sheh)
a sprout; by analogy, grass -- (tender) grass, green, (tender)herb.