Exodus 21:13

If a man lie not in wait, but God deliver him into his hand. — If, that is, without malice aforethought, a man happen upon his enemy, God’s providence bringing the two into contact without man’s contrivance, and the result is that one slay the other, then the law of the refuge or asylum shall come in. A place is to be provided whither the man-slayer may flee, and where he may be safe, at any rate until the cause is inquired into. Hitherto, throughout the East, it had been regarded as the duty of the next of kin to avenge homicide of whatever kind, and blood had been exacted for blood, however sudden, however provoked, however excusable had been the homicide. No right of asylum, so far as we know, had ever been established before. The Sinaitic legislation for the first time interposed the “city of refuge,” between the “avenger of blood” and his victim. It was for the elders of the city to see that the privilege was not abused. Where the case was doubtful, the man-slayer had to be remitted for trial to the elders of his own town (Numbers 35:22); where the elders considered his claim made out, he was entitled to protection.