It is he that giveth
nathan (naw-than')
to give, used with greatest latitude of application (put, make, etc.)
salvation
tshuw`ah (tesh-oo-aw')
rescue (literal or figurative, pers., national or spir.) -- deliverance, help, safety, salvation, victory.
unto kings
melek (meh'-lek)
a king -- king, royal.
who delivereth
patsah (paw-tsaw')
to rend, i.e. open (especially the mouth) -- deliver, gape, open, rid, utter.
David
David (daw-veed')
loving; David, the youngest son of Jesse -- David.
his servant
`ebed (eh'-bed)
a servant -- bondage, bondman, (bond-)servant, (man-)servant.
from the hurtful
ra` (rah)
bad or (as noun) evil (natural or moral)one), worse(-st), wretchedness, wrong. (Incl. feminine raaah; as adjective or noun.).
sword
chereb (kheh'-reb)
drought; also a cutting instrument (from its destructive effect), as a knife, sword, or other sharp implement -- axe, dagger, knife, mattock, sword, tool.