'Man slayer' in the Bible

that the manslayer might flee thither, who should kill his neighbour unawares, and hated him not previously, that fleeing to one of these cities, he might live:

lest the avenger of blood pursue the manslayer, while his heart is hot, and overtake him, because the way is long, and smite him mortally; whereas he was not worthy of death, since he hated him not previously.