The LORD
Yhovah (yeh-ho-vaw')
(the) self-Existent or Eternal; Jehovah, Jewish national name of God -- Jehovah, the Lord.
is the portion
manah (maw-naw')
something weighed out, i.e. (generally) a division; specifically (of food) a ration; also a lot -- such things as belonged, part, portion.
of mine inheritance
cheleq (khay'lek)
smoothness (of the tongue); also an allotment -- flattery, inheritance, part, partake, portion.
and of my cup
kowc (koce)
a cup (as a container), often figuratively, a lot (as if a potion); also some unclean bird, probably an owl (perhaps from the cup-like cavity of its eye) -- cup, (small) owl.
thou maintainest
tamak (taw-mak')
to sustain; by implication, to obtain, keep fast; figuratively, to help, follow close -- (take, up-)hold (up), maintain, retain, stay (up).
my lot
gowral (go-rawl')
properly, a pebble, i.e. a lot (small stones being used for that purpose); figuratively, a portion or destiny (as if determined by lot) -- lot.