He is the tower
Migdowl (mig-dole')
Migdol, a place in Egypt -- Migdol, tower.
gadal (gaw-dal')
advance, boast, bring up, exceed, excellent, be(-come, do, give, make, wax), great(-er, come to...estate, + things), grow(up),increase, lift up, magnify(-ifical), be much set by, nourish (up), pass, promote, proudly (spoken), tower.
of salvation
yshuw`ah (yesh-oo'-aw)
something saved, i.e. (abstractly) deliverance; hence, aid, victory, prosperity -- deliverance, health, help(-ing), salvation, save, saving (health), welfare.
for his king
melek (meh'-lek)
a king -- king, royal.
and sheweth
`asah (aw-saw')
to do or make, in the broadest sense and widest application
mercy
checed (kheh'-sed)
kindness; by implication (towards God) piety: rarely (by opposition) reproof, or (subject.) beauty
to his anointed
mashiyach (maw-shee'-akh)
anointed; usually a consecrated person (as a king, priest, or saint); specifically, the Messiah -- anointed, Messiah.
unto David
David (daw-veed')
loving; David, the youngest son of Jesse -- David.
and to his seed
zera` (zeh'-rah)
seed; figuratively, fruit, plant, sowing-time, posterity -- carnally, child, fruitful, seed(-time), sowing-time.
for
`ad (ad)
especially with a preposition); as far (or long, or much) as, whether of space (even unto) or time (during, while, until) or degree (equally with)
evermore
`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