Ye have said
'amar (aw-mar')
to say (used with great latitude)
It is vain
shav' (shawv)
evil (as destructive), literally (ruin) or morally (especially guile); figuratively idolatry (as false, subjective), uselessness (as deceptive, objective; also adverbially, in vain) -- false(-ly), lie, lying, vain, vanity.
to serve
`abad (aw-bad')
to work (in any sense); by implication, to serve, till, (causatively) enslave, etc.
God
'elohiym (el-o-heem')
angels, exceeding, God (gods)(-dess, -ly), (very) great, judges, mighty.
and what profit
betsa` (beh'-tsah)
plunder; by extension, gain (usually unjust) -- covetousness, (dishonest) gain, lucre, profit.
is it that we have kept
shamar (shaw-mar')
to hedge about (as with thorns), i.e. guard; generally, to protect, attend to, etc.
his ordinance
mishmereth (mish-mer'-reth)
watch, i.e. the act (custody), or (concr.) the sentry, the post; obj. preservation, or (concr.) safe; fig. observance, i.e. (abstr.) duty or (obj.) a usage or party -- charge, keep, or to be kept, office, ordinace, safeguard, ward, watch.
and that we have walked
halak (haw-lak')
to walk (in a great variety of applications, literally and figuratively)
mournfully
qdoranniyth (ked-o-ran-neeth')
blackish ones (i.e. in sackcloth); used adverbially, in mourning weeds -- mournfully.
before
paniym (paw-neem')
the face (as the part that turns); used in a great variety of applications (literally and figuratively); also (with prepositional prefix) as a preposition (before, etc.)
the LORD
Yhovah (yeh-ho-vaw')
(the) self-Existent or Eternal; Jehovah, Jewish national name of God -- Jehovah, the Lord.
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)