Because he should have remained
yashab (yaw-shab')
to sit down (specifically as judge. in ambush, in quiet); by implication, to dwell, to remain; causatively, to settle, to marry
in the city
`iyr (eer)
or (in the plural) par {awr}; or ayar (Judges 10:4) {aw-yar'}; a city (a place guarded by waking or a watch) in the widest sense (even of a mere encampment or post) -- Ai (from margin), city, court (from margin), town.
of his refuge
miqlat (mik-lawt')
an asylum (as a receptacle) -- refuge.
until the death
maveth (maw'-veth)
death (natural or violent); concretely, the dead, their place or state (hades); figuratively, pestilence, ruin -- (be) dead(-ly), death, die(-d).
of the high
gadowl (gaw-dole')
great (in any sense); hence, older; also insolent
priest
kohen (ko-hane')
literally, one officiating, a priest; also (by courtesy) an acting priest (although a layman) -- chief ruler, own, priest, prince, principal officer.
but after
'achar (akh-ar')
the hind part; generally used as an adverb or conjunction, after (in various senses)
the death
maveth (maw'-veth)
death (natural or violent); concretely, the dead, their place or state (hades); figuratively, pestilence, ruin -- (be) dead(-ly), death, die(-d).
of the high
gadowl (gaw-dole')
great (in any sense); hence, older; also insolent
priest
kohen (ko-hane')
literally, one officiating, a priest; also (by courtesy) an acting priest (although a layman) -- chief ruler, own, priest, prince, principal officer.
the slayer
ratsach (raw-tsakh')
to dash in pieces, i.e. kill (a human being), especially to murder -- put to death, kill, (man-)slay(-er), murder(-er).
shall return
shuwb (shoob)
to turn back (hence, away) transitively or intransitively, literally or figuratively
into the land
'erets (eh'-rets)
the earth (at large, or partitively a land) -- common, country, earth, field, ground, land, natins, way, + wilderness, world.
of his possession
'achuzzah (akh-ooz-zaw')
something seized, i.e. a possession (especially of land) -- possession.