And slew
harag (haw-rag')
to smite with deadly intent -- destroy, out of hand, kill, murder(-er), put to (death), make (slaughter), slay(-er), surely.
famous
'addiyr (ad-deer')
wide or (generally) large; figuratively, powerful -- excellent, famous, gallant, glorious, goodly, lordly, mighty(-ier one), noble, principal, worthy.
kings
melek (meh'-lek)
a king -- king, royal.
for his mercy
checed (kheh'-sed)
kindness; by implication (towards God) piety: rarely (by opposition) reproof, or (subject.) beauty
endureth 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