Halakhah su Proverbi 28:17

It is from the roots of the commandment [that] since the iniquity of killing is very weighty, as the destruction of the world [comes] through it, to the point that they, may their memory be blessed, said (Mishneh Torah, Laws of Murderer and the Preservation of Life 4:9) that one who kills a soul volitionally - even if the did all of the [other] commandments - is not saved from judgement, as it is stated (Proverbs 28:17), "A man oppressed by bloodguilt will flee to a pit; let none give him support"; therefore it is fitting for one who killed, that since such a great mishap as this came through his hand, that he should endure the pain of exile for it, which is almost equal to the pain of death - as a person is separated from his friends, and from his birthplace and [instead] dwells with strangers all of his days. And there is also benefit to the world with the commandment - as Scripture elucidates - since he will be saved from his blood avenger through this, such that he not kill him when he has no guilt on his hands; as behold, it was inadvertent. And there is another benefit in the thing, such that the relatives of the slain not see the slayer, the killer, regularly with their eyes in the place that the evil was done. And all 'the ways of the Torah are pleasantness.'