For those unfamiliar with the concept of sanctuary cities, here is a short lesson. Sanctuary cities were established in Old Testament law (Numbers 35:11) to protect someone who had killed another person by accident and without malice aforethought from "the avenger of blood," who might be a close relative of the dead person. Under the priestly code, the accused was removed from the city and put on trial. If he was found innocent of murder, he was returned under guard to the sanctuary city in which he had claimed asylum. He enjoyed protection until the Jewish high priest died, at which point he was free to leave the city without fear of harm.