Before I go
yalak (yaw-lak')
to walk; causatively, to carry (in various senses)
whence I shall not return
shuwb (shoob)
to turn back (hence, away) transitively or intransitively, literally or figuratively
even to the land
'erets (eh'-rets)
the earth (at large, or partitively a land) -- common, country, earth, field, ground, land, natins, way, + wilderness, world.
of darkness
choshek (kho-shek')
the dark; hence (literally) darkness; figuratively, misery, destruction, death, ignorance, sorrow, wickedness -- dark(-ness), night, obscurity.
and the shadow of death
tsalmaveth (tsal-maw'-veth)
shade of death, i.e. the grave (figuratively, calamity) -- shadow of death.