The revenger
ga'al  (gaw-al')
to redeem (according to the Oriental law of kinship), i.e. to be the next of kin (and as such to buy back a relative's property, marry his widow, etc.);
of blood
dam  (dawm)
blood (as that which when shed causes death) of man or an animal; by analogy, the juice of the grape; figuratively (especially in the plural) bloodshed (i.e. drops of blood)
himself shall slay
muwth  (mooth)
causatively, to kill
the murderer
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).
when he meeteth
paga`  (paw-gah')
to impinge, by accident or violence, or (figuratively) by importunity
him he
huw'  (hoo)
the third person pronoun singular, he (she or it)
shall slay
muwth  (mooth)
causatively, to kill