Thou therefore O LORD
Yhovah  (yeh-ho-vaw')
(the) self-Existent or Eternal; Jehovah, Jewish national name of God -- Jehovah, the Lord.
'elohiym  (el-o-heem')
angels, exceeding, God (gods)(-dess, -ly), (very) great, judges, mighty.
of hosts
tsaba'  (tsaw-baw')
a mass of persons (or figuratively, things), especially reg. organized for war (an army); by implication, a campaign, literally or figuratively (specifically, hardship, worship)
the God
'elohiym  (el-o-heem')
angels, exceeding, God (gods)(-dess, -ly), (very) great, judges, mighty.
of Israel
Yisra'el  (yis-raw-ale')
he will rule as God; Jisrael, a symbolical name of Jacob; also (typically) of his posterity: --Israel.
quwts  (koots)
to awake -- arise, (be) (a-)wake, watch.
to visit
paqad  (paw-kad')
to visit (with friendly or hostile intent); by analogy, to oversee, muster, charge, care for, miss, deposit, etc.
all the heathen
gowy  (go'-ee)
a foreign nation; hence, a Gentile; also (figuratively) a troop of animals, or a flight of locusts -- Gentile, heathen, nation, people.
be not merciful
chanan  (khaw-nan')
to bend or stoop in kindness to an inferior; to favor, bestow; causatively to implore (i.e. move to favor by petition)
to any wicked
'aven  (aw-ven')
to come to naught); strictly nothingness; also trouble. vanity, wickedness; specifically an idol
bagad  (baw-gad')
to cover (with a garment); figuratively, to act covertly; by implication, to pillage
celah  (seh'-law)
suspension (of music), i.e. pause -- Selah.