Numbers 35:23

Or with any stone wherewith a man may die,.... Which is sufficient to kill a man, if thrown at him: seeing him not; and so without intention: the Jews (s) from hence gather, that a blind man is to be acquitted and dismissed, and not banished and so stands in no need of a city of refuge; though others say he is to be banished, and needs it, and ought to have the privilege of it: and cast it upon him that he die; casting, it upon another account, and with another view, but yet falling upon a man, it kills him: and was not his enemy, neither sought him harm; it was never known that they were at variance, or that the slayer had ever by any overt act discovered any malice and enmity against the deceased, by word or deed, or ever sought to do him any injury, either to his person or property. (s) Misn. Maccot, c. 2. sect. 3.

If he neglected thus to surrender himself, it was at his peril; if the avenger of blood met him elsewhere, or overtook him loitering in his way to the city of refuge, and slew him, his blood was upon his own head, because he did not make use of the security which God had provided for him.