And the firstborn
bkowr  (bek-ore')
firstborn; hence, chief -- eldest (son), firstborn(-ling).
of the poor
dal  (dal)
dangling, i.e. (by implication) weak or thin -- lean, needy, poor (man), weaker.
shall feed
ra`ah  (raw-aw')
to tend a flock; i.e. pasture it; intransitively, to graze; generally to rule; by extension, to associate with (as a friend)
and the needy
'ebyown  (eb-yone')
destitute -- beggar, needy, poor (man).
shall lie down
rabats  (raw-bats')
to crouch (on all four legs folded, like a recumbent animal); be implication, to recline, repose, brood, lurk, imbed
in safety
betach  (beh'takh)
a place of refuge; abstract, safety, both the fact (security) and the feeling (trust); often (adverb with or without preposition) safely
and I will kill
muwth  (mooth)
causatively, to kill
thy root
sheresh  (sheh'-resh)
a root -- bottom, deep, heel, root.
with famine
ra`ab  (raw-awb')
hunger (more or less extensive) -- dearth, famine, + famished, hunger.
and he shall slay
harag  (haw-rag')
to smite with deadly intent -- destroy, out of hand, kill, murder(-er), put to (death), make (slaughter), slay(-er), surely.
thy remnant
sh'eriyth  (sheh-ay-reeth')
a remainder or residual (surviving, final) portion -- that had escaped, be left, posterity, remain(-der), remnant, residue, rest.