The LORD
Yhovah (yeh-ho-vaw')
(the) self-Existent or Eternal; Jehovah, Jewish national name of God -- Jehovah, the Lord.
knoweth
yada` (yaw-dah')
to know (properly, to ascertain by seeing); used in a great variety of senses, figuratively, literally, euphemistically and inferentially
the days
yowm (yome)
a day (as the warm hours),
of the upright
tamiym (taw-meem')
without blemish, complete, full, perfect, sincerely (-ity), sound, without spot, undefiled, upright(-ly), whole.
and their inheritance
nachalah (nakh-al-aw')
something inherited, i.e. (abstractly) occupancy, or (concretely) an heirloom; generally an estate, patrimony or portion -- heritage, to inherit, inheritance, possession.
shall be for ever
`owlam (o-lawm')
concealed, i.e. the vanishing point; generally, time out of mind (past or future), i.e. (practically) eternity; frequentatively, adverbial (especially with prepositional prefix) always