For I have said
'amar (aw-mar')
to say (used with great latitude)
Mercy
checed (kheh'-sed)
kindness; by implication (towards God) piety: rarely (by opposition) reproof, or (subject.) beauty
shall be built up
banah (baw-naw')
to build (literally and figuratively) -- (begin to) build(-er), obtain children, make, repair, set (up), surely.
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
thy faithfulness
'emuwnah (em-oo-naw')
literally firmness; figuratively security; morally fidelity -- faith(-ful, -ly, -ness, (man), set office, stability, steady, truly, truth, verily.
shalt thou establish
kuwn (koon)
to be erect (i.e. stand perpendicular); hence (causatively) to set up, in a great variety of applications
in the very heavens
shamayim (shaw-mah'-yim)
air, astrologer, heaven(-s).