Deuteronomy 19:11-13

New Revised Standard Version, Anglicised

¹¹ But if someone at enmity with another lies in wait and attacks and takes the life of that person, and flees into one of these cities, ¹² then the elders of the killer’s city shall send to have the culprit taken from there and handed over to the avenger of blood to be put to death. ¹³ Show no pity; you shall purge the guilt of innocent blood from Israel, so that it may go well with you.